Here's some things regarding the JS the devs may want to look at:
A. There is an issue with the quasar device, the single most important item of a JS in my modest opinion. It has the same buff type as the cygnus reactor: Recharge reactor - BOOST (activated). The quasar buff lasts 1600 seconds and adds 39.90 % recharge while the Cygnus lasts only 10 seconds and gives 48.00 % recharge. When you, or a group member, uses the Cygnus it overrides (cancels out) the much better quasar buff.
B. The JS-only L8 shield, the glorious kimono, is rather redundant. Compared to other shields it is slightly lower cap and the L9 guardian gives two of the most important buffs on that shield, only much more powerful.
C. The group bonus is: 'warp recovery time'. That's not warp charge in that its engagement and recovery times, its only the recovery time. I must say, in Gordon Ramsay's voice: ''WHAT IS THAT?!''
D. The way in which reactor optimization improves with level does not scale properly. It goes:
1 - 5% cap (self only)
2 - 10% cap (self only)
3 - 10% cap 10% recharge (self only)
4 - 15% cap 10% recharge (self only)
5 - 20% cap (anyone)
6 - 20% cap 10% recharge (anyone)
7 - 25% cap 20% recharge (anyone)
As reactor recharge is what this skill is about mainly, levels 4 and 5 don't add much. Level 6 is at least recharge you can cast on others, and L7 is a leap of improvement.
Being a solo player I didnt upgrade reactor optimization past L3 until I was able to upgrade straight to L7.
Also, there is apparently no buff to improve reactor optimization, to make it cast faster for example. At the moment