I've been reading about recumbents and am seriously considering buying one. Today, I rode a Sun AX and a Rans Stratus; both had a small (16"?) front wheel and felt sort of 'squirlly.' Is that normal for first time riders? How long does it take to adjust to that feeling? Would a 26" wheel be more stable? Would there be a difference with an USS model? Thanks for any answers you can give me.