If you post in the Glow engine forum you will get A much better informed answer from A factory rep. It's an answer that takes A lot of finger talk and probably already covered.
I have gotten my Hye mounts from Central Hobbies.
The mount beams are flexing and the rubber at the fire wall is shifting and absorbing.
So far the best mount I have used for A sport plane has been the anti vibe mount made and sold through Jtec. I have only used it for A YS 1.40 sport mounted in an Extra but wow, no vibration at all and the price was right.
When you see the price of A Hyde mount you will understand my thinking, outstanding mounts but just too much money for A sport pilot.