I have the same boots - thing is the opening is too wide so I have the problem of it popping out over the shins. I used a heat gun to make the front of the boots stiffer so it doesn't pop out but it still does. I remedied this by gluing straps inside my shins and doing the "stirrup" method so the top of the boots remain under the shins and it works (I have a hard time putting it on though - I need a 36" metal shoe horn to put them on).
I ordered new ones from Imperial Boots recently and I should receive them soon. I'll let you know how that goes.
