Compare "my" iCLRM20 with other weapons, e.g. a HAG/20
Both weigh 10t, have the same heat, damage and damage spread.
The LRM have slightly (even) better range than the HAG/20, can fire indirectly have the advantage of special ammo (versatility), on the con side the minimum range.
"My" iCLRM10 is roughly comparable to a ATM9. 5t vs. 5t, 4 heat vs. 6 heat, same range for *LRM* missiles, more ammo per ton for the iCLRM (12 vs. 7 shots), ammo selection with damage variety for ATM vs. indirect fire and versatility for iCLRM.
While I'm not a fan of much improved weapons, my suggestions:
1) Minimum range of '6'
2) Tonnage like the IS standard counterpart or a clan streak launcher (2t, 5t , 7t,10t).
Compared to ATMs they are too good.
Range.
So, in my book, they are improved enough.