Okay, well first DV is killing your bass.
EQ 1 with 1 port open is the deepest extension mode, but you lose some energy in the audible part of the spectrum to make up for it. I've done a lot of experimenting with my VTF-3s and much prefer the additional headroom you get from EQ2 with both ports open. EQ 1 with 1 port open makes my bass sound anemic and weak, imo.
Try this, turn DV off. It's a compression thing and filters a lot of stuff out. Also make sure LFC Containment is off. Leave DEQ on and experiment with the different RLO settings. Check out these charts, I saved them for an occasion just like this!
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Everything should be pretty clearly labeled. You can see in the 2nd chart, EQ 2 with both ports open, has more energy in the audible range, which is still lower than most music goes. The top chart, EQ 1 with 1 port open, has deeper extension with more energy in the subsonic frequencies. There's very little music that even goes that deep, and those are the frequencies you can't even hear ("sub" sonic)!
Also note the effects of DEQ and the different RLO settings. I think between your sub port/EQ setting and turning DV off it should damn near be night and day difference.