I'm not trying to take sides here, just a voice of support. I've dealt with Chris recently on springs and he is there and available, just really busy. 5 emails with no response sounds like a bit of a problem but I know he's covered up and working, and as helpful as he can be, or at least he has always been to me. I can say I think he hangs around on Expo a lot more than here these days, and his bread and butter are the home builders there, so just contribute to his thread there and maybe it will generate a quicker response.
He has 3 kids and runs his own business so I try to cut him as much slack as I can, personally.