WA: HS-6, first off, that WSF you're so fond of, and rightly so, they're from the same base chemistry. HS-6 is the 9mm velocity powder all other's are judged by, unless you've played with Blue Dot and compressed loads. Pressure is not an issue, and the IPSC boys do push it. 1435 FPS is what it takes to get a 115 gr. bullet to 165 PF.
Listen children, best know what you're doin' here. These loads are typically loaded for 1911s with long throats and long OACLs. But, from the SPEER #11, back before the days of Bill Clinton and incompetent engineers/ballisticians/ambulance chasers, the load was a 115 gr. SPEER JHP with a max charge of 8.2 grs. of HS-6. The load chronographed 1300 + FPS from their Beretta 92. IPSC shooters go a bit higher. If you feel maxed out at 1200 FPS with a 115 gr. JHP, maybe 12 gauge field loads are the answer, but if you feel that kinetic energy was worthy of Einsteins theory, well, it does tend to balance the playing field.
Gun rags have got the majority of their ad. $ for many years, from custom 1911 makers. The old 9mm vs. .45 ACP debate was about like a 9 game world series with the Chicago BlackSox. The fix was in, so forgetabouitit. The OACL of the SPEER load was under 1.100". I don't load JHPs shorter than 1.122"/28.5mm. In Sigs and Glocks, I load to 1.142"/ 29mm.
If you're inclined, work up slowly, 8.2 grs. is under 35,700 CUP/38,500 PSI (+P). I hate to lay this on you, but WSF will do all of the same with a lower charge. But hey, HS-6 is worth trying!