I got a remora with the maxijet 1200 (same one thats on my seaclone) and after running it for 3 weeks in my 55gal reef tank, I had to pull it and put the seaclone back in. The remora never worked right, was very noisy, always making way too much watery skimmate, even when the cup was adjusted as far up as possible. I put the seaclone back in and it started working right away. IMO the Remora is a POS.
yeah, it's a high maintenance piece but if you clean the foam prefilter whenever it gets full of gunk, monitor the air bleed valve and keep it properly adjusted per directions, AND disassemble it once in awhile to thoroughly clean it, it should work for you. I have had mine for about 3 years and it has always produced a dark concentrated skimmate, as long as I maintain it.
As for a new air valve, you should be able to find a decent one at your LFS that is easier to adjust than the one that comes with the Seaclone.