Along with that 50-60 percent grad rate came historically high RFS rates.
275Anger!, the RSM talked about the rank structure a bit, saying they wanted the minimum rank to be spc, but not limit SGT's to just leadership positions, BTL a SGT, ATL a SSG, and SL a SSG. Someone asked about basically the same thing you were proposing above with the SFC's and above, and the answer was basically they don't want to deal with the D. of the Army on senior NCO promotions. So I think there is some headway being made in that respect. certainly that identifier is a help.
I really like the idea of a JFKSWCS-type school house being started, as this will open up more non-deployable positions from within Regiment, which may keep that SSG with 8 deployments under his belt think twice about getting out.
The main thing that I think needs to happen, is more carefully select the guys graduating RASP, and then our TL's and SL's aren't wasting there time with RFS packets. Anyone who has ever been in Regiment has seen it, if there is a period where they push people through, it just means more RFS packets, not more Rangers who stay for the long run.