There isn't problem with the guns themselves. It's just that they seem to have no advantages over even the cheapest 2.0 class 9 guns. For example:
ONYX / BLOODSTONE have the same DPS (2222 / 2240) and consume less energy (476 / 494).
BLUE BLAZE has much higher DPS (2460) and consumes the same amount of energy as Magmas (506), and much less than the other two.
Considering the low prices of ONYX and BLOODSTONE and the lack of tech counter, there is no reason to not use them over faction 2.0 guns.
============== Light Fighters ==============
There are still two main categories of LFs:
The good ones - Liberator, Tanto, Onuris, Manaslu, Surveyor, etc
The mostly useless ones - Griffin, Gecko, Caracal, Tournez, etc
The former typically have very small size and high agility. Armor varies (Liberator - 5400, Onuris - 6800).
The latter have VHF sizes, varying agility (Gecko is fast, Caracal is slow) and varying armor (Griffin - 5400, Tournez - 6900).
There are, of course, some that are between the two groups.
They all have the same 850/8500 powercore.
The main problem of the second group is their VHF size and, in some cases, slowness. The ultra-small and agile ships of the first group are often referred as "troll-ships" that are impossible to kill.
The new LF guns aren't going to affect the survivability differences in any way.
I propose to change the second group in at least two of the following ways:
Median armor of ~7000
Median agility of ~85 deg/sec.
At least 900/9000 powercore (with the new weapons it will matter)
Nerfing the first group would render them unable to deal any meaningful damage, I fear.