Deep Stops

[DRE]

Personally I start my deepstops deeper, at 80% of the profile in ATA (different from depth in feet) for all my dives. For rec dives, 50% does work and it's always based on max depth during the dive, as that is the max compression you encounter for inert gas to be absorbed into the bloodstream. If you spend most of your time at a shallower depth (like you mentioned 70ft) you're basically already doing a deepstop, but moving around does affect the offgassing, so as you ascend keeping as still as possible will be the most efficient in terms of offgassing, as well as being completely horizontal in the water column.