I'm curious as to why the 31K laser would not perform as expected.
Not too sure - spent a lot of time trying to tweak their color and brightness output, but they just didn't punch like we all expected them too.
Where your 7 31ks blended to do all the pyramids behind the two screens?
3 on stage left, 3 on stage right, and 1 on the mountain, correct. The two side screens were 10'x30' blended with dual 20k's.
Decklink Quad 2's?
No - we tried to use Decklink's but performance was spotty. Never got consistent FPS performance it seemed. Also, BlackMagic cards get weird when you have multiple cards in the machine, in our testing.
EDIT: I saw your other posts about 4K HDMI to 4x SDI converters. Just curious which ones you're using.
Correct, we've been using AJA HA5-4k's for a while now, we own 6 of them which is great. They let us do 4K to Quad HD-SDI, the only limitation is that the outputs are all progressive, so doing 1080/60P is sometimes difficult being 3G HD-SDI. Otherwise, been a great solution for us.