ickmann
Here some tips. I have observed this issue with goalies migrating to butterfly from standup or newbies.
So let's start with pads. Most pads can be configured to rotate.Box style ones will rotate better as the squared inner edge hits the ice first and pushes the pad to a vertical or wall position in the butterfly.
A Heaton 10 has rounded inside edges (i.e. more of a traditional inside gusset). As such you will have to rely on strapping your pads loosely. The top two straps should be very loose. Like near the last hole. The legs straps should be three fingers loose as a minimum. That is to say you can get 3 fingers in loosely when they are strapped to your leg.
The straps that go under your boot should have them strapped in such a way that they just reach taughtness when you are in a deep crouch. Standing up right, they would be loose.
Be sure to put a loop in the toe strings. Refer to the Vaughn Hockey web site under goaltending resources and the article "How to get the most out of your Vaughn Velocity pads".
This allows the foot to move in the boot area of the pad and relieves stress on the knee and ankle.
Next is the stance. Your feet need to be wider than you shoulders. Your knees should be a little apart as well (like 6 to 10 inches). If your knees are close together, you end up with a narrow butterfly or worse, the pads going face down. With the knees being apart, it allows you to drive the kness down properly, resulting in pad rotation. Too narrow and the pads go face down.
I noticed this in giving clinics locally here in Oakville. New butterfly goalies, even with straps done loosely, still had the pads going face down. They started with a narrower stance and kness together.
The minute you get their knees separated a little, their butterfly improves immensely
Look at Yann Danis' stance here.
Theodore
Raycroft
Give it a try. Hope it helps.
Ken