Your lead-ins can be shorter if you wish, but are fine. Change your Pierce Clearance to 0. (The value is added to your lead in / out.)
For 3/8" I would adjust your Post Settings as follows:
Cut Height (really should measure, but this is a guess) - .04
IHS Spring Back - 0.00 (Fusion will add an additional .02. This places your Cut Height at .06)
Pierce Delay - 1.5 (Adjust as you see results.)
Pierce Height - .13 (Again the .02 is added providing .15 Pierce Height.)
Retract - 1 is fine.
RW45 at 40-45 amp with std (1mm) consumables. I prefer to cut at 18ipm for 3/8"