Proper inflation for a 2003 Zodiac CFR 310 Activ-V

[CaliforniaDreamin']

This model has the inflatable floor. I have a basic foot bellows pump and I see no designation for high vs. low pressure inflation. I'm not sure how to tell when the tubes and floor are properly inflated. What concerns me is that when I turn the engine (9.8 hp Nissan) to higher RPMs, the top of the transom seems to bend back.

I thought about not turning the engine to higher RPMs, but sometimes I like to go fast.

How do I know when the tubes and floor are properly inflated, until I can find a decent pressure gauge?

Thanks!