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We do quite a bit of thread milling here on a variety of materials. We use single form, partial form, and full form thread mills as well, but I can't say that I have used an NPT thread mill. I don't want to write the obvious, but like other features, having your tool drawn exactly to size is critical.
I'm not following your process so I'll write what I do.
New Feature
From Dimensions-Thread Milling
Type is ID
Select Standard Thread and choose 3/4-14 NPT
All I would adjust here is the thread depth
Next select the location
Next page I select Positive. I have found I get much better threads when I plunge to depth and climb mill. Of course this will be operation specific. I do rough and finish, and usually 1 spring pass.
There is no 3/4-14 so you have to draw one.
I got the attached dimensions using Harvey Thread Mill PN 70226
Should be straight forward from there. As always if it is an expensive part I would use some positive cutter comp and work the tolerance in until I found the right numbers. As long as I draw the tool right the program has always been within .001"-.002". Hope this helps.