The mason had mentioned to me that on a similar job he'd done before it helped to have a chute to drag along the top of the forms. The key - according to him - was a 2" wide piece of wood running down the center of the chute. The purpose of the wood was to split the concrete so it did not damage the T-mass panel. You can sort of see it in one of the pictures.
I built this thing based on his description. I thought I'd get creative so I made it with one of the short ends extending down into the form, but with a slot cut into it that straddled the T-mass panel, too. As a joke, I painted an arrow on it to let the guy know that you had to drag the slot ahead of the fill. Well, that didn't work very well. When I tested it, the slot got hung up on the foam so I cut off. Of course, that meant the arrow had to become double ended ;-)
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