Don't think any of the guys use a full on eastern backhand for their twist and kick serves.
Instead, they use a continental grip with a half way towards eastern backhand grip.
The consistency is the high arcing flight of the ball, lots of net clearance, dropping well inside the service line, with a full swing speed, but maybe 40 mph slower than their fastest flat serves hit with a grip more towards true conti, or even a dose of eForehand in their conti grips.
You should TRY hitting full eastern backhand on serves. All spin, no pace.