Yeah there's a chance it's the pot I guess, I occasionally get a lot of screechy feedback with the pedal rocked all the way forward. Are they easy to source and replace then?
Plenty easy, dunlop (who i'm pretty sure make vox also, or at least used to) do hotpotz replacements, and there's plenty of bespoke ICAR taper pots from various boutique places like area 51 who also do a complete pre-assembled wiring harness. If you're in the UK, Stu castledine does a similar thing.
The CAE is a great wah, but i prefer fulltones. Although if someone asked me what to buy, i'd probably say the CAE as well because as far as readily available, high quality wahs go, you can't beat em.