Problem : ships could use a bit more variations to tone down the power creep. Specially the rank 4, 5, 7’s and 8’s, which could fit some niche spots like machete did, right now it mostly only makes sense to use top tier ranks exclusively.
Example with ECM’s in tier 3: R8 jericho ecm has same increased ecm range bonus as R9 empire ecm (which makes it the most desirable trait in an ecm), which is considerably better choice. Lower ranks could do with some more appeal and usefulness, since as of now there is no reason to use jericho one in favor of the empire. This is just one of many. Same with Hydra 2 and Cerbreus 2 being the best engineers, while lower ranks stand there pointlessly.
Solution: you could rework the sinergy system so lower ranks would have much more sinergy levels to gain, and higher ranks would start off with higher base level and thus less grind needed to make them fully powerful.
I am talking about sinergy levels 1-50 here, R4 start at 1, R5 at 20 and R6 at 40, while all ships are able to attain max level 50. Leveling would take considerably longer this way and would also make much more sense to actually get sinergy - since all R4-R6 ships are equal in power once leveled up to 50, but with different stats and bonuses so we get more variety this way. There is so many possibilities.
You would still have a choice not to grind a low ranked ship and just buy the R6 when possible, or if you want a bit of a different gameplay, level your lower rank which would get you a nice reward, a more unique ship that can compare to R6 and give your more options, equals more interesting which is also more fun.