I couldn't fit my UMS in on UCAS so eitherway I can't put them in. Could always get it mentioned in my tutor reference but I've got a thousand extenuating circumstances to go in there so need that space badly.
If you're an excellent all rounder then I can't see a slightly lower UMS having much impact at all.
Don't stress too hard over them, though I suppose it's easier said than done. I'm applying with some *very* inconsistent UMS and although I do have some really good reasons for it, it's still a worry, I have serious doubts about even getting an interview. But I just made my PS the best I possibly could whilst staying true to my interests and will bust my butt for the TSA to hopefully get interviewed in December and wedge a foot in the door.