I've had great luck with the 1020 Fel-Pro, however I once accidently installed some other Fel-Pro P/N...must ahve been a cheaper alternative line they make. No time at all before a coolant leak between ehad and block. Comparing the two, the cheaper one was terrible...great gaping areas (holes) between the metal cyl rings and the rest of the gasket. So, the point is, some gaskets are really bad, so stick to the 1020.
I havn't had to re-torque a 1020, although it's a good idea. I tried once, but no movement. They didn't compress enough over time to allow loose enough head bolts that I could overcome the intial torque (force to overcome friction) to get them to move.
One other thought. It's not uncommon for a little engine
oil to seep past the spark-plug threads. It gathers and runs along the head gasket and makes it look like a leak. Do a visual inspection around the plugs with a flashlight and even remove plugs that looks suspect for a better view.