Another thing:

I guess I just picked up on what you said about doing the WTG pass using the M3.

This is cutting down on your straight razor acclimation time! The WTG pass is probably the easiest pass to make with a straight, so I'd suggest using the straight for the WTG, XTG, and ATG if you're game for still trying to go for ATG at this point. Save the M3 to touch up the rough/missed spots once you are all done with the straight.

Anyhow, just a suggestion.

And one more thing: The Henckels 7/8's are terrific shavers, but they are also quite finicky in regards to getting an excellent edge on them. Don't let me talk you out of getting one, but they are not easy "cruise control" razors in my opinion.

Keep at it!

And read up on proper stropping. It takes alot of effort just to get that aspect "right". But when you do, the resulting edge is very refined and smooth!