Do you have a triple chain ring on your new bike, Allie? You may have moved from a triple on your MB to a double on your RB... that will be significant to what you notice on hills. You can always get a triple for your RB...

You will find as you get used to the hills on your new bike, that you will slowly get faster on the RB because it is so much lighter.

The comparitive lightness is probably what makes it feel a bit squirrelly... but you'll get used to the feel of it and be able to control it easily.

You'll come to love it... when I hop back on my old Black Thunder MB, it just feels so heavy and clunky.

Good luck on the fitting and being able to reach the brakes etc... looking forward to hearing how you grow into it...