Perhaps you might try one week on each Opt, and see which of them produces the best results...Dont forget the safety factor, which is only spending a short time on each of the Opts, per night!
my second name has a letter c at the beginning not sI personally find this to be a very interesting project/concept. I have zero experience with these devices, but am planning on building one with the schems from Mr. Shiverton.
The amount of work, and research that you guys put into these units is, for lacj of a better word, astonishing.
Keep up the good work ladies and gentlemen, and we may well see TT in our life times after all.