We won't be changing to a telescopic handle - this is a very high output bass cab and there is no way a handle like that would stay rattle free in the very longterm, even if we could make it work initially (the cab would have to be made bigger as well to fit an airtight sub-enclosure around the handle and all the bracing would have to be changed too). We try to provide options by having both wheels and a top handle and side handles at the balance point. If you're shorter/weaker, then wheel it, if you're taller/stronger then carry it. I'm taller than you and will generally pick a Super Twin up for going a distance but wheel it about for shifting it around a room. You can't make the ergonomics perfect for everyone because everyone is different. The Big Twin 2 is taller and heavier so more people will wheel it about.
If you were to test the frequency response of the Super Twin you'd find it isn't at all midrangey - it just doesn't have any dips in the midrange, whilst most bass cabs do, especially out in the room off-axis. You're just hearing the reality of your bass/hands/amp for the first time! The drivers do smoothen out a bit in the first few hours of high SPL use. Glad you're liking it though!