As long as you're happy, that's all that matters.
My point wasn't research based (be good to see yours though, if you have it to hand), it was more theory-based. You say it's important to run a tankful of premium super through now and again due to the extra cleaning chemicals, correct? If that's the case, I'm assuming then that you're aware that the various products I mentioned will do much more short-term help than a single tank of premium super will, as they're much more potent.
I've run numerous cars from MR2s, 350Z, MX5, Impreza, 911 and the Mini both before and after using a can of 10K Boost. It makes so much more of a difference to the engine than any minor change running premium super over non-premium super does, which is why I'd recommend doing that and saving yourself a few quid.