Definitely no reason not to try other subs. The only thing I’ll say about that, is moving up the SVS food chain will be much like moving on to a different sub company. Don’t get me wrong, the pb1k is a great little sub for the entry market, but I wouldn’t compare it to anything else in the SVS stable. OTOH, I think there is potentially better value out there. I mean that academically, as the peace of mind that comes with dealing with SVS is almost unmatched. But on paper only, there are better/equal performers out there. You might not get the bill of rights and trade in program, or built in peq and all that, but that might not matter. If you trust your AVR to do the EQ, and/or have a minidsp(iirc you don’t) then the peq won’t matter to you.
Imo, HSU is probably the best value/bang for your buck out there, but I have a pair of Rythmiks , or JTR’s on my personal wish list.
Also, even though you’ve had it for awhile, email ed directly and he might still work with you. He’s been known to help forum members(on avs too) even with special cases.