I have heard cool tubes don't get the same light coverage as other hoods. Because you have so many cool tubes you should try something different. Get a regular hood, but a sealed one. They are just as cool as a cool tube but might get better light coverage.

I have a cool tube that mounts 2 1000 watters or 2 600 watters. I have one 1000 watt MH and a 1000 watt Super HPS. I don't think it gets much better than that, lots of spectrum, power, and coolness.

Either way, you know you will be fine.