Hi, Alex. If you want to maintain a surfy feel and those angles, then you'd be best off with the Burton Step-ons as we were discussing on youtube. I don't feel hard boots are the right fit for what you are looking for.
As an example, I run hard boots on my alpine boards which all have a waist around 22 cm. My angles there are 55 front, 50 rear which are typical or maybe a little shallow for a hard boot setup.
On my freeride board which has a waist of a little over 26 cm I am running the Burton Step-on Xs and Burton Ion boots, which is the stiffest step-on rig they sell. My angles there are 27 front, 12 rear which would be on the steep side for most people in soft boots.
It's generally acknowledged that the transition zone between hard and soft is in the 35-45 degree angle range. Soft boots don't work very well at all at angles over 45 and start getting iffy around 35, unless you make so many mods you may as well run hard boots.