The unfortunate issue here is that it's an issue of the have's verses the have not's.
T4 LWF is pretty much a manditory fitting just to move beyond a mind numbing crawl, therein lies a major break in the game. Older, established players/corps have ready access to such items, where newer players are just stuck out in the cold.
Newer players dare not attempt to approach beta islands because they know they'll be overrun by the first T4 equipped light that sees them, piloted by a 5 month old experienced player they cannot match... not because of the difference in EP, but because the older player has a fat corp supplying them with cheap high tier mods the younger player never even sees on the market much less can afford.
And besides, speed (and chiefly the lack thereof), is the biggest thing that kills enjoyment of this game. Highways should double a bot's speed, straightoff, and there should be highways between all TPs and buildings... but player corps would have to build/maintain them for their own outposts.
Weight should, as stated, affect the acceleration of a bot not its top speed. Going uphill should not limit top speed either, just increase the affect weight has on acceleration, inversely going downhill.