[Yoda]

When I do some mirror work, my backswing is between top and end. Can you still be a hitter and go all the way to end?

You can still Hit, woodmo, despite an End Backstroke, but the procedure becomes problematic. That's because as the Backstroke moves away from the Top of the Straight Line Delivery Path (10-23-A/B) and approaches the End (10-24-C/D) the pull of gravity loads only the Secondary Lever (the Golf Club) via the #3 Lag Pressure Point against the Right Hand's first knuckle (and on the top of the Shaft).

This is as opposed to the Hitter's Top of the Line Loading of the entire Primary Lever (the Club and Left Arm) with the # 3 Pressure Point Loading remaining in the fleshy pad of the Right Forefinger (and against the back of the Shaft). This proper Loading must be restored if the Hitter takes his Backstroke to the End.

Also, the Re-Tracing necessary from End to Top, produces an almost irresistable tendency toward Longitudinal Acceleration of the Swinger's Drag Loading (instead of the Hitter's Radial Acceleration and Drive Loading).

So, yes, you can go to End and still Hit. But, once you understand the problems and risks encountered, the question becomes...

Why would you want to?