SOP..sold em all for a year and didn't find then that the HSS had decent adjustments... I like my SOP cause it can expand or contract to fit amount of clothing under, etc.
When I sit, I tend to reach back on the SOP and slide the Prusic knot up till it's slight taught... then if I lean out, it pulls back, keeps me centered and when I shoot, I don't fear losing balance sitting. That way it also draws up any slack in the set up. I shoot sitting more'n standing anymore.
Either that...(uh-oh--trouble's comin)
or cut back on Ms. Kim's cookies so's the chest straps aren't tapering OUTWARD toward that belt line! Eliminate some of the "slack"
(groan...I'm dead meat now...Deadyankee walkin)