Some people do not like the blackhawk grip. For myself, I can't get my whole hand on the grip and I'm not comfortable shooting that way. While I haven't shot a .45 that way, the others that I've shot did not feel good in my hand. I switched to a Bisley configuration and recoil basically became a non-issue.
With the load that you are describing, recoil should be very mild. Actually a lesser level than I load my light loads. Bullet style is up to you. I think that round nose type bullets are most 'authentic' for CAS type shooting, but one shouldn't have an advantage over the other.
You can have fixed sighted revolvers regulated, by modifying the front sight or, I think, turning the barrel.