You are DEFINITELY over killing your space.
If your bulbs came with your ballast, or you ordered the same ones that did, then you're good to go. Just turn the switch to 75% or 50% and don't sweat it.
All you ever want to make sure of is that you run bulbs rated for the maximum power rating of your ballast. So you will ALWAYS run 1000 watt bulbs. Don't ever, ever buy anything else.
I've been running a 600 watt dimmable. I only do two plants at a time and run the MH in Veg at 50%, then run the HPS at 100% at 600 watts.
It works to perfection.
Edit to add: super lumen gives you the effect of about 50 more watts. Frankly, I've never used it and never will.
600 watts is plenty to do a 4 x 4 space. 1000 is used for up to 6 x 6. So, frankly, in your setup I'd never run it above 75%. Hell, you'd be fine at 50%. 500 watts is plenty for an area that size.