Looking good, Jack. I've grown G13-Haze, and she can stretch quite a bit in flower. I ScrOGed them under a 250w-- the screen was set to 10", and the colas reached a solid foot after filling the screen. It looks like you have a bit of extra floor space, so if you are concerned about height, consider training them to shorten them a bit. You need not tie them down like mad, just buy yourself 6" or so.
In terms of light distance, I have no direct experience, but what I have read indicates that you need at least 8" from the 1000w bulb.
Good luck!