Hi Tiny,
I know what you're experiencing. I tried using Hodgdon's FMJ data to create loads for Valiant and Star 230gr LRN and TC bullets using Titegroup. Most of the Hodgdon FMJ maximum listed loads would barely function the slide, and chronographed around 500-600fps with 230gr cast lead. After experimenting with loads, I ended up with two conclusions: you either need a very heavy crimp (I used a Lee FCD), or you need to boost the load a bit over maximum. A warning is that the pressure builds up quickly beyond the max so be SURE to measure the loads carefully.
Hodgdon's max for FMJ is,IIRC, 4.8, and I went a few tenths over that after experimentation in my Glock 30. I'd recommend working up slow from 4.1grs until you get good function. Don't worry about the lack of absolutely perfect data, just load carefully. Truth be told, you are NEVER going to get perfect data for the exact cast bullet that you are using. Every bit of data is still going to result in you making an educated guess to some degree. Since you're loading for a power factor that seems to be for IDPA, don't worry too much about speed, you only have to hit 720 or so fps to make custom defense pistol. The momentum based figure makes it easy to use 230gr .45 loads.