Sunfish,
I am sure you will find that in a flight or two you will be pulling 4-5G manouvres with no problems at all. G tolerance seems to build up fairly quickly in most people. Keep at it mate, it is the most fun you can have with your pants on. Mind you if I had have had a "Sylvia" instructing me in aerobatics, perhaps I could rephrase that last point!
Cheers
Mr B.