ah, sucks. I often do one more rep approx 1 min after a set w. overhand grip and just stand as long as my grip allows. Made some decent grip strength progress this way but chalk is still a lifesaver. Specially on hot days.
Thanks for the answer, Towers.
Manlet limit was set here at 6' earlier but I'd think below 180cm is more accurate. Will depend on where you live though.
Coz then im not a manlet
TK beat me to it with an awesome chart