For these jams I've been primarily listening through a pair of Sony MDR-V6 Headphones, which I also typically use for mixing. They should be pretty similar to yours in terms of having minimal frequency enhancements.
I would also agree with you that listening to mixes from different sources will help you achieve the sound you're looking for. Personally, I didn't find my (very minor) critique to be as prominent when I listened again through speakers.
Also, I just read in your Miro board that you're relatively new to mixing, and honestly I felt this was solid work if that's the case. I think as you start to get more comfortable with mixing, and thinking a little more critically about where different instruments sit in the frequency spectrum, you'll start to get a better ear for how to balance instruments in a mix. I still feel I'm learning new things about the mixing process several years later. Keep on practicing and doing your thing!
Hopefully this helps!