Hi!
All running in should be with full throttle opening! And all adjustments be done with the high speed needle! -Simple as that!
Why? Because that way you know that the engine gets enough fuel!

As your engine is ringed engine it needs a rich running in.
Thast means slobbering rich the first tanks and then gradually leaning the high speed needle. After a few 3-5 tanks it could be flown..or flown the first tank if you prefer that , as long as you set it fairly rich!
Suitable glow plug is an Enya 3 or OS 8.