i use a break in that many people dont and do it cause its easy ,i use a run in bench basically an engine mount fuel tank and a areoplane prop ,works a treat start engine then just let it run ,altering tune a bit to alter temps a bit ,do 1.5 ltrs this way then about 5 tanks to finish and fine tune
I used to break mine in like that too. Thinking about going back to this method, at least for the first 3-4 tanks.