Your load is exactly where you want to be, don’t let anyone influence you to bump it up.
Here is my chrono data with three different lots of Bullseye, all the loads are just about 800 fps, which is where I want to be, and that is the velocity of the original 1910 load (with a 230 FMJ).
As for your failure to feed, sounds like the slide follower is locking the slide back. Why, heck if I know.
Code:
Kimber Custom Classic
230 gr LRN Valiant 4.5 grs Bullseye lot BE532 (80's mfgr) Mixed Brass WLP (brass) OAL 1.250" taper crimp .469"
16-May-09 high 83 °F
Ave Vel = 782.7
Std Dev = 13.41
ES = 52.05
High = 815.5
Low = 763.4
N = 28
230 gr LRN Valiant 4.5 grs Bullseye 99' & 2005 mixed lot Mixed Brass WLP (brass) OAL 1.250" taper crimp .469"
16-May-09 high 83 °F
Ave Vel = 805.2
Std Dev = 38.07
ES = 136.9
High = 912.4
Low = 775.5
N = 24
230 gr LRN Valiant 4.5 grs Bullseye lot 827 (60's/70's powder) Mixed Brass WLP (brass) OAL 1.250" taper crimp .469"
16-May-09 high 83 °F
Ave Vel = 822.9
Std Dev = 14.14
ES = 55.24
High = 853.7
Low = 798.4
N = 26