[SiliconeSword]

For the 2021 buckings I recommend 70°-85°.

For the nub, I suggest that you make the one in my signature as it's as good as the Masada arm but retains the use of the return spring in an AA chamber, and costs about $5 to make 100 of them.

 

[SiliconeSword]

I really haven't seen a performance difference between 60° and 80° regular buckings when it came to the older Maple Leaf ones, but 50° sucked the most even at low power.
I like 70°, but I'm gonna buy an 85° since I tried one and liked it exactly as much, but it won't wear out as fast.
70° 2021 will be difficult to wear out, but 85-° should be immortal.