Well, currently its a bit off.
Gemini launchers are lighter than the more stupid Sunflare.
The Sunflare, Iceflare, Starflare have the same mass (figures, I guess the mechanics are about the same)

Jackhammer and Screamers have the same mass?

An improvement would be to add a heavy weight penalty to all the homing weapons, making them more unpleasant to carry in large amounts (tri-gem valk or an all-seeker hornet should really -feel- painful.)

The flares (and to some extent jackhammers) require flexibility and manouverability to be usable in a skillfull manner, encourage ingame skill, make them as light, or lighter, than the energyweapons that are popular at the same, and lower levels. (Tachyons fex.)

I feel that rockets already are at an disadvantage compared to all other weapons, due to the incredibly low ammo storage for the large universe, and the high level requirements for a wepaon that just doesn't cut it for "botting", therefore providing little or no practice other than for PvP players.

Don't forget rails. 800kg for a rail launcher vs 400kg for a Gemini launcher. With rails, the maneuverability is a NECESSITY. Don't nerf my rails with weight. :(