A wonderful first light. You must be thrilled.
Anacortes has a table with the spacings for various models. You need the exact metal back distance for that reducer. It should be in their table. I have found them to be very accurate in the past.
Here it is : 71.5mm:
https://www.buytelescopes.com/takaha...oa-150b-132837
It looks like a small amount of tilt as well as the stars are not distorted to the same degree in each corner.
Greg.