yea as the others have said its very lean mate. you will actually start to loose power if you go to lean. i would say there would be some power to be made if you dropped that by about 1 afr point.
high 12s is fine on stock pistons/rings. had my high comp 5efhte set at at for quite some time (at least 6 months) before i cleaned and tested my injectors.
did a comp check the other day during one of my regular maintenance checks and still running full compression.
im now running mine at low 12s to be a bit more on the safe side.. its to easy for things to go wrong on a high comp engine.
11s is very rich. for peak power high 12s is where you want to have it ideally. low 12s for a compromise between safety and power. this is all imo however.everyone will have their own.
deff get it re tuned asap as i wouldnt be comfortable running it at that level. would only take something such as a very cool day/night and you to give it the beans for it to go pop.