Cincy_bob,
I have the rim drive on a SSM as well and have just implemented a Critical Mass Master platform with it. This, I think, is similar to your SRA. I have currently stopped using my replacement feet in favor of the rubber feet which came on my particular motor housing unit coupled with adhesive felt pads from Home Depot. This is working quite well for me currently and I suspect if you're not noticing a problem you don't need to change much. Get that softer drive belt when it's available.
I have the rim drive on a SSM as well and have just implemented a Critical Mass Master platform with it. This, I think, is similar to your SRA. I have currently stopped using my replacement feet in favor of the rubber feet which came on my particular motor housing unit coupled with adhesive felt pads from Home Depot. This is working quite well for me currently and I suspect if you're not noticing a problem you don't need to change much. Get that softer drive belt when it's available.