How old are the gaskets? They may shrink some as the get heated up. I never bothered to torque them, I use a 3/8" ratchet and watch the gasket.....guess Ive done a few...

I always use right stuff gasket maker (SPARINGLY) on all my gaskets, and let it set up before using it. usually never have a leak.....

You can always tighten it till it strips and back it off a 1/4 turn.

I used to care but....... things have changed