In my Sig, P-220 I load the 230gr XTP on top of 8gr Power Pistol with an average of 918+- 3 fps and pretty darned accurate.
In the Colt 1911 I load up a little heavier 260gr Speer Mag JHP on top of your same Herco powder at 6.8 grains. Velocity out of this pistol averages 850+- 2 and is absolute hell on a hog scull
BUT you need to manage your grip well as that load has a little bit of a buck to it.
The other 2 .45's I can't remember off the top of my head what I load them at but I think it's pretty close to the P-220. Same bullet but I think just a touch less on the powder.