I can't tell by your number....is that 1,200 or 12,000 miles?

Modern car oil can allow the cam and rockers to wear out really quickly, as there is not enough ZDDP in the oil.

When he did a leakdown test and only got 30%.....did he determine where the leak is (cylinder/valves)?  If the bike was run low on oil and the piston/cylinder was damaged, it can cause both low compression and a noisy engine.

There really isn't a warm up period required or recommended for the Savage engine...start it up, use a bit of throttle to keep the rpm up to a fast idle to supply adequate oil pressure to the engine, then in 30 seconds or so ride away gently and don't use full throttle until you get a few miles down the road and the engine is up to temperature.    

Oh wait a minute......are you flipping us the middle finger in the photo you posted to "Introduce Yourself"?

And now you want our help?

autopsy the filter. I'm more able to picture a rocker/cam , just because after ten years here, that's what I'd expect. You're close enough to cam chain tensioner check to justify going in if you can't locate and eliminate the noise.

I would pop a valve cover, get some light on the cam.
If that's inconclusive, loosen the adjustments, blow the crap from down around the plug, pull it,  pop the inspection plate, rotate, listen, and, look under the rocker while the cam is down.
I wouldn't concern myself with compression, Ohhh wait, someone Already pulled the plug and went fiddling,,, and, whatever crunchy stuff was sitting down in the head, unless the mechanic blew it out,,,
Anyway, if it PULLS, and makes power, how bad is it? Low compression can't  run like a healthy motor.