I have a similar problem with a hdcam m2000 deck
I am tape editing ( yes some people still do) using a bve2000 as controller
The m2000 always edits 1 frame late ( a edit synchronised at 10:00:00:00 edits at 10:00:00.01) on the in and out (in accurate sync mode)
The machine constants are correct ( although changes do not effect the edit point)
Any suggestions?