I have done 3 mash brews now and i have worked out the efficiency of mash all of them have been around 92% is this because i am the king or will it have negative effects
If you are hitting 92% then all it really means is your getting the most out of your grains. Given that grain is fairly cheap it's not terribly significant and there are undoubtedly other things you might want to focus on to improve your beer.