In reply to USAF-Falcon87
I usually SOI the WPN page once TGP is on the targets, and directly slew the missile head to the target. Works faster imho. If you want to use the auto handoff I suggest TMS down followed with TMS up to force a handoff.
Just tested it. When first AGM away, TMS down. Slew to next target and TMS up. This will initiate a new handoff. Just spamming the TMS up without TMS down first will do nothing.
edit: spelling and addition