I used a couple of Workhorse 7 or 8 ballasts to overdrive some 48 inch T5HO tubes. They're great ballasts and very flexible in their ability to run different tube combos. I have some additional data saved on a hard drive. Along with the diagrams, which you've found, I also have a chart showing all the Workhorse ballasts & what tube combos you can run with them.
Still have the ballasts somewhere in the basement, need to wade through the junk & find them. Got some stuff going on this evening, but I should have more info for you tomorrow. Basically it comes down to not exceeding the rated wattage of the ballast by using the correct number of wires for the bulb combo you wish to run. I played around a bit with hooking up extra wires to overdrive my tubes.
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