My suggestion is to make sure you don't make the compound tooo stiff. you'll want to allow it a little flex
If you use too much hardener and make it too stiff you'll run the risk of tweakin your tranny mounts and brackets.
we learned this the hard way when we were trying out different combinations.
IMO the medium stiffness ones worked the best. It's also what I'm using now.
Another piece of advice is to NOT do the side mounts. Front only works good and is what I use. Max you should do is Front/rear.