Cattleya Lc Tropical Pointer repot advice

[farley101]

Hey all,

I picked up this catt this summer from a gathering of the MN Orchid Society. It was in spike and bloomed very nicely about a month later. The seller recommended that after the blooms were done that it should be repotted. It's growing out of the pot in 2 directions and the medium looks pretty gnarly, old bark I believe but more roots than anything in the pot. See below for pics.
I have seen other sources say to wait until there is new root growth to repot, but I am really having issues with being able to tell if it needs water because of the medium being so bad(?). After my last few questions I think I can guess the answer, to just go ahead and do it, but looking for confirmation that I am not going to do something bad if I do!
It's currently in a 4" pot, I'm thinking a 6" pot will be needed to contain all the overflow.
I'm fine with holding off as well, will need to increase water frequency since it seems there isn't much in the pot to hold onto it!
Thanks for taking a look, any comments/advice appreciated.