IMO, I'd ditch the Schwinn, soley based on your description. It sounds like the other 2 bikes are set up perfectly and they work well. I detect a hint of excitement when you describe them. I got the impression that while the Schwinn is a good bike now, it wasn't prior to the upgrades, and perhaps you still don't "love" it? So there you go...lol.

For the record, I love Schwinn bikes.