Dump it, the upgrade route is never cost effective. Stick with the Marantz.
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Don't spend money upgrading (modifying)the Capitol. If it doesn't work well for you now as is, maybe it's not the player for your system. Tube rolling should be enough. Sounds like it's not a good match with your other gear. The funds you invest in an upgrade will be lost in total should you ever decide to sell.
Definitly have it done by someone local. Those pads are just neoprene pads easily relicated. The caps are right on top and easily replaced. Very big improvement in my system although it sounds like you have some standing wave problem or whatever. When you see the size of the old caps you'll see why. I did mine for about 250.00 total parts and install and I didn't have to have it kicked all the way to Canada and back.
The Cap reference does not have boomy bass by itself.
Here is a very simple trick to find out if your player is suffering from standing wave "bass boom":
Play a track with heavy bass (not a single-note solo, you want the bass notes to go all the way from top to bottom) and walk around the room with your ears at the player's height.
Hear for bass boom where your player is located. If boominess is present, keep walking, find a spot with no boominess, place the player exactly in that spot.
P.S. Sometimes a higher or lower shelf will get rid of standing waves, because room modes propagate in three axis.