It may be that the Safire is more slack geometry than what you are used to. Many older HTs are the more race type geometry where your butt in higher, and your shoulders are lower; "laid out". The Safire is more slack, a little more of the "sit up and beg" kind of geometry which in the long run will be more stable especially on technical trails and down hills.

What size bike is it? Just curious.

You might experiment with your body English as you get used to you new bike. Be sure you are off the saddle, weighted on your pedals, hips back when you go down hills. Relax and let the suspension do it's job. That will also feel new to you, if you've been riding hard tails.

Where are you located?