Spaz, you should just weld that throne of yours up and be done with it. You can make minor adjustments to the height with the legs
You really need to go into a shop and sit on some thrones to try them out. Play on a kit if possible. I didn't think I would like motorcycle seat style thrones - until I bought one. I wanted a backrest, but didn't want to pay the ridiculous amount Tama/Pearl charge (twice the amount of a non-backrest throne here!). So I got a cheapo, which is very solid and very good. If I played 12 hours a day I might try something different, but in this day and age I think you are pretty safe with the 'budget' thrones for the usage you suggest.
Hope this helps.