Impact angle is N/I in BMS or rather the setting is not adjustable via the MFD value, IIRC.
You might have gotten longer toss range with the older BMS JDAMs because they shot out like a rocket at 300 knots.
I tried a LAT with JDAM and oddly the anticipation cues for pull up while wrong (too early) for dumb bombs seem exactly right for JDAM. As soon as the circle started to flash I started a sedate pull up and the caret was in the middle of the LAR as I pitched through the 30-45 degree zone. I think my standoff was ~7nm. What you won’t see is any meaningful caret-and-LAR cues of when to initiate the maneuver.
The CCRP IAM mode seems fully compatible with LAT for JDAM at release conditions. I dare say the LAT anticipation cues are even accurate. I’m really not seeing a problem here.