Mate - one thing to understand is that the midbass is directly under the seat and 70% of it is lost due to the positioning. I am fully aware that most would consider it to be set too high ie playing too much of the mid ranges but I felt the sound far too tweet heavy without it.
Hear it some time (ideally once I've sorted the rest of the sound deadening) and I expect you to agree.
HOWEVER. I can see what you're saying about the sub. Rationale is I like it loud. Simple as that. But I can remove up to 11.5 dB from the amp whenever I want.. So when not in shootout mode so to speak, it's not at all overpowering ;-) It simply isn't. But I am after SPL first with the sub.
I wonder if you realise that this is my third massive system, always tuned by myself, and that the last 2 have been magazine featured - but we'll meet some time once I've gotten my sound deadening done
On DSP preset C I have sub at 150Hz cutoff with 12db curve using butterworth which means a sharper taper and less crossover. however I personally feel it sounds significantly worse. but to each their own. I will keep tinkering