Two tips i was given that really helped me are:
1) Widen your grip on the boom by moving you back hand out towards the outhaul. This will stabilize your stance and make it easie to remain on the plane when going for the back strap.
2) Underhand Boom Grip. Hold onto the boom with your front hand upside-down. When you get that catapult felling a quick weight transition into your front hand will de-power the rig and prevent you going round the front (most times

)
Having said this i think i probably sprain a toe every couple of weeks kicking the footstrap when getting the back foot in