I started out a couple of years ago (maybe more) with an old Japanese Vito, (a YTS23 clone) It was a good horn but the step from C to D always bothered me as the intonation was markedly different. I also had a problem with upper G where I would get a screech until I or the instrument warmed up.
Some time ago I found a Yanisagawa u900 in absolute pristine condition, so bought it.
My intonation problems have disappeared but my G problems are worse.
I play a Couf *4 special (rare) with a 2.5 Rico reed, Plasticover seem to work the best, and also a Berg Larson S.Steel 100 1 M with a 2 1/4 Legere plastic reed to stop the annoying squeaks that you get with cane. Only to be replaced with gurgling since the plastic does not absorb the moisture. I sound like a kid at McDonalds after a few minutes.
No matter what I do I get a screech for a G until the instrument warms up.
The Berg is worse than the Couf and much more difficult to play but when the screech is gone it stays gone as long as the mpc is warm, the Couf is less predictable but much easier to play. I am probably getting ahead of myself but I did not want to blame the instrument so bought good plumbing to learn on.
Any Thoughts??