without going , there are plenty of specific oil threads recommending 5w30. For that reason and for the reason I do not have oil issues, I would not put anything else in. I believe that if you have a revup model, you should just accept the oil loss as a trait of the car and top up accordingly. That's my opinion.
Bringing it back on topic now (and coming away from the Dblock shlong measuring competition), I would say that the OP needs to get some seperate opinions on the tapping, perhaps from a few different garages. By putting a thicker oil in, you are not curing the problem.
My car has just hit 90k, doesn't lose a drop between services (maybe that's because I only do 4k a year). It also is a very quiet engine without any suspect tapping. My advice would be to follow Alex's advice and check valve clearances and wear on the cam lobes. Changing the cams is a pretty hefty job, but cross that bridge if needed.
Good luck and let us all know how you get one
Schlocg measuring? I don't know why you can't accept what I'm saying. Read the post directly below yours. You tell me like I'm new to these cars lol.