cheaper coupling caps on a budget

Thanks guys. Last summer I installed mundorf supreme caps in my amps [rogue audio m150s] liked the sound overall, but noticed less bass. original value was 2.7 and I put in 2.2s .there was an issue with space inside the amps so I installed the smaller value. that has to be what I am hearing.

my amps started life with m-caps 2.7 value. I sent them to rogue for upgrades [ before there was an official m180 upgrade] they came back with cheap polystyrene caps bypassed with mundorf mcap supreme .47 value. did not like the sound, shure it was more extended in the highs and lows, but it lost the midrange warmth and smoothness it had before . after speaking with some experts in the industry the consensus was that the bypassing of two very different caps was not optimal for better sound. out came the caps ,this time replaced by a single mundorf supreme 2.2 value, this was much better than the bypassed caps, but I could hear less bass from my system. so I don't know if I should bypass the 2.2 value with other mundorf supreme .47 value, or try a different cap all together , there is an issue with space inside the amps. This has opened a can of worms for me, because now I realize just how much caps effect the sound. I dont want [and cant afford] to try all of the different caps out there.

thanks guys !