Hello, again, joker.
I am still on my journey of finding my most suitable IEM. SO far I have been satisfied with both the GR07 mk2 and the Gr07 BE. I have no major gripes with either, I just wish the bass was somewhere in between the two.
If those don't compare well with the GR07 I may just have to go back to the MK2 and EQ its bass to my likings. I may also just give the Fidelio S2 before doing so.
Here's how to improve the bass response on the regular GR07, block the front vent next to the nozzle with a piece of tape, and boom, subbbass kick is improved. If you think this is too much, puncture a hole with a needle and it's tamed a little, but still with a boosted subbass, better than stock.