If i am not mistaken the boots you have, the prions are a very stiff boot, and might make you feel a bit wobbly.
I have these prions-
On Sale 32 - Thirty Two Prion Snowboard Boots Black/Pink - Womens up to 70% off
I got them for less than $55 and the places I've looked at said that they're pretty medium to soft. Maybe it's just the newer prions??