I'm on the right track then!!

Never really thought of doing that but dont see much point in it, except maybe for like how u said sniping.. But even then it would only be for sniping mechs so yea...

a baphometh with 2x med. AC/MG and 3 small laser is actually possible, and pretty powerfull -> but even with prototype gear: SLOOOOOW.

with enough extensions, you could field a 2x med firearm, or 1x firearm 1x med launcher Prometheus.

even 2x med gauss cannon (T2) is possible on prometheus.

Doing just a general look at Medium dispersion;

Robot size/Weapon Dispersion = % hit
With Precision 10; you get 30% reduction in Dispersion ()

Med Laser - 8 (5.6)
Med Mag - 10 (7)
Med mach gun - 12 (8.4)
Med Auto Can - 10 (7)

Robot Size

Light - 2.75 to 4.0 3.0 for most non-industrial
Assualt - 4.0
Mech - 7.0 to 9.0; 8.0 for most non-industrial

Looking at Med. vs assult (applicable to any Med weapon regardless of bot mounted on)

4/8(5.6)  = 50% to 71% hit chance
4/10(7)     = 40% to 57% hit chance
4/12(8.4)  = 33% to 48 % hit chance

In general, med. lasers would be better suited for Baph vs. assualt, but at best your going to see a 29% reduction in dps.

Using my above tested numbers than,

(22 dmg / 3 cycles ps) = 7.3 dps per small turret
(50 dmg / 4.5 cycles ps) = 11.1 dps per med turret

[note my cycle times are much lower due to extensions, but using base values for both will give normalized results]

7.3 * 3 turrets = 21.9 dps
11.1 *2 turrets = 22.2 dps

total = 44.1 vs Mech or larger

vs. assualts however 22.2dps *.71 = 15.87 + 21.9 = 37.77 dps.
With 5 small turrets * 7.3 = 36.5 Dps

a 3% dmg increase vs assult bots but a 17% increase vs Mechs or larger.

* Note these numbers are based on actual damges from combat logs using chemo in both types, so while the values may vary the %'s will likely remain constant vs different resistances. I also have skill 5 in both Med and small, but the baph adds 5% to small lasers. Increasing Med laser skills will make the 3% gap grow without 'wasting' EP in basic robotics or basic optics. Advanced laser is 5 (15%) now, going to 10 would add an additional 15% to 18% total, not to include skills that decrease cycle time.

hey.
your trying to do more damage with two mediums on an assault vs. assaults.

funny thing - because i know so many topics complaining about how weak medium weapons are against assaults, even with the robot bonus from mechs, and at least 4 of them.

Update: Current fit

Std Sensor Amp and std Laser tuner
(2) Std small hcl laser and (2) T2 small lasers with (1) Std Med laser on Baph
LWF, Small Repper, Std Coreactor

Some numbers (weapons as fitted):

AP: 627
RP: 329 (325 used)
Speed: 66.42 KPH
Crit: 10%
Lock Range: 273 m ( Amp off : 203m)

Small Lasers (T1/2 same):
Cycle: 2.94 Sec
Dmg: 154%
Hit D: 2.37
Rng: 173m / 100m Falloff

Med Laser(T1):
Cycle: 3.68 Sec
Dmg: 162%
Hit D: 6.32
Rng: 201m / 110m Falloff

RP numbers (Fitted/Base)

Std Med: 164/200
Std Light: 33/40
T2 Light:  30/36

Went out rating some Assault/Light bots with chemo ammo. Functionally the Med laser chews up Acuumulator way to fast for sustained fighting. Found it more useful to only use the med laser on the Assualts and let acc recharge while fighting the light bots in the pack; because of dispersion of the Med laser and slightly longer cycle time it only hit 1-2 times before the bot was dead anyway.

I will change out the repper for an T2 aux acc as it will be required if I ever fit a second Med on this thing. (T2 Aux acc uses 6 less RP than the repper also).

I also noticed that there were a couple shots where the small laser hit but the med was 'Blocked by obstacle". I'll need to watch more closely next time, I do move around alot, so it may not be something where med is more sensitve to slope.

My over all impression so far  - the small dps increase over time is negated by the larger acc useage on assaults.

Where to next - Range.

I have a good chunk of EP in sniping skills but the smalls are still at 173 M optimal, while the Med is 201 M. Locking at 273 M all the lasers are still within the falloff and if I can lock I can fire; the advantage I can see with the med laser here is to put a little more DPS on the target before the smalls become effective. The HCL model has a base range of 300M, but uses 30 more RP per fit. However, 2 of those with dual sensor amps would give this bot some punch out fairly far; this would be if i was expecting to go against mechs. (It could scare Ewar to see laser fire that far out from an assualt, but the dispersion on light bots is so bad that it would be more pink floyd then pew pew).

more to come...