Well that 46LA manual is really quite dramatic. Is it okay to run it "slightly" rich for a full tank on it's first tank? I would still run it up to full throttle, run it the level just lean of where the engine begins to pick up rpms and run it at quarter throttle for a tank...

Slightly richer than optimum? Isn't that already the way you should be flying it? (three clicks rich from optimum rpm or 200rpm less than max)