To Syag:
First and most important, Rav Ralbag, shlita, is a chashuvah rav and a big talmid chacham but like most non-chassideshe Mashgichim, he has his own set of chumrahs and kulahs that he goes by (e.g. can goyim participate in wine preparation prior to the separation of the skin from grape juice per the inyan of mevushal, the use of certain casks in whiskey, etc). If you are comfortable with those kulahs Rav Ralbag is “reliable”. If you want a higher standard across the board, find one of several chassideshe hashgachos (and perhaps one or two of the litvish hashgachos) who are considered the gold standard for mehadrim. No lashon horah about R. Ralbag is appropriate given that these are areas of discretion and everyone finds their own “norm”.