Use rom_tool to trim them. Senran 2 is not actually 4GB - it's around ~2.2GB. I just looked up Project 未来, and that's about 2.1GB.And now I'm in a conundrum: I've got 10.7GB in my microSD cards to put in "acquisitioned games", of which 4GB will be for my MH4G dump, giving me about 6.7GB. I'm lost as to put in Project Mirai or Senran "BOOOOOOOOOOBS" Kagura 2, of which both are 4GB each.
If you trim them both, you can fit them both.
Edit: Same with MH4G. It's just over 2GB after you trim out the garbage data.