Sorry for the double post but it seems I've misplaced the capx for my boulderdash game, I was going to grab a few screenshots of the events from that! Whoops!
However, a perhaps better workaround is giving all the blocks the platformer and solid behaviours, and turning off default controls for the platformer. This negates the need to use 'overlapping at offset' entirely, which I have had some issues with a few times in C2.
Give it a go and let me know how it goes!