I wouldn't refoam unless your foam is waterlogged.
Reinforcement is a good idea if you're planning on smacking the ski around a little
Compression sounds good to me. I'd leave it alone or do as Zig said and inspect it.
I've thought about dual cooling myself but in these waters it sounds like it it unnecessary.
For my ski I am planning on doing a RN pole conversion (RN pole, bracket, possibly some reinforcement in bracket area)
I also think it's about darn time for some footholds. I have yet to decide for sure but if I get a bug up my *ss and strip the turf, IT'S ON!
I may go with a Wet Wolf cone this year too, although my ski hits pretty good on the bottom right now.
Other than that I've been really happy with my ski so I can't warrant doing much more than that