what's up bill!
this is exactly my progression:
"double overhand -> hook grip -> mixed grip -> straps? With chalk?"
i can double overhand with a 140kg, depending on the barbell. if i get a thicker barbell, i may be able to do a single.
hook grip used to be my favourite but...it hurts like hell, and i can't get around the pain and thus I did singles for my deadlift to get around the pain.
mixed grip is my main grip now. i used to ignore it, never like it, but i want to do heavy deadlift.
i have been using straps for 2 sessions now. :-) my straps are still new, got it from the straps from a sling bag that i hardly use anymore. and it is giving my strap burn on my wrist. :-)
cheers,
raymond