There are as many opinions about break in as there are members here..
My new DAX engine gets 25/1 Valvoline 2 stroke oil in its premix, Duane told me they recommend running 25/1 as the standard mix, not just for break in.
My bike ran very rich at first, but dropping the needle and putting in a .66mm jet from SBP got that straightened out and it's running well and getting stronger each ride now. This town is at 975 feet above sea level.
I vary the throttle and take it easy 95% of the ride, and after it's warmed up I might give it full throttle for a few seconds, just to see if there's any improvement.
Then right back to half to 3/4 throttle. Mine is doing real well, but cold weather here is cramping my ridin time all ready.
Good luck to ya, check your mounting bolts regularly, don't forget to check the exhaust mounting nuts, too!
Heck, check everything.