i wouldnt face them forward. Its obvious your slamming hard. Dynomat or something similar is the best option. Once you do that make sure your actual deck lid is tight to the metal. You might need to put some velcro under it to attach it to the metal or wort case put a screw in it.

Dont do the foam stuff. Its messy,ghetto,looks like shit, and permanent.

With dynomat you wont see it and will actually benifit even if you take the system out.

way to go on yourslamming sytem