People will and can shoot me for saying it, but I'm not totally convinced by some of the compression tests one can do, especially if with one of those things with a rubber bung on the end. There are so many variables - hot, cold, oily, dry, etc. Hot and oily is best maybe, with throttle well open (well,that's what some unused gizmo hereabouts says on it).
I spent an interesting half day a few weeks ago with the relevant gauges off an old 'Sun' leak tester (and a compressor to pump it up) in a friend's shed. The 'results' dictated a head overhaul on one bike (ex valve leakage), a bigger engine rebuild on another (where the leakage seemed to be past the rings rather than a simple valve thing) and a blown head gasket on a vintage car (leakage between Nos 2 and 3 cylinders). We turned up a dummy spark plug and adapter to get round the rubber bung problem: better, but there were still 'leaks'. Not huge, but leaks nonetheless.
Not doubting at all what the toy told us - eyes to see, gauges can't lie, etc. The question was - what difference would it make?
Subsequent Expensive Head Job (valves, seats, guides, springs and so on) on first patient (a very well-maintained 500cc single not of the marque) made no noticeable difference to performance in any way (it ran pretty darn well before), and the jury's still out on the others, which were also running well.
Reckon he regrets ever having plumbed the thing in!
If it isn't breathing heavily, using oil, running like a lame dog, oiling up etc etc, personally I'd keep on running it until something actually reinforces the diagnosis. I absolutely refused to plug my A - which is what I was on that day - into the thing, as I reckon it was and still is running fine.
I may be totally cavalier and courting trouble and future expense, but . . . If it ain't broke . . . .