As another not-so-tall dude, here's my setup:
ARs with red dots: 2 clicks out from collapsed (nose-to-charging handle).
ARs with scopes: 4 clicks out from collapsed, which gives me a 13" length of pull and puts the ocular at the end of the charging handle. This is the same LOP as on my precision rifles, and works standing, kneeling, prone, etc.