I may have missed it...but I don't think I read you mentioning anything about the increased heat in your cab with the MH as opposed to the HPS.
i had read that they run a few degrees hotter...but i think with good ventilation it wouldn't equate to 3-4 degrees hotter...maybe a degree hotter...but then again i don't really pay attention to my temps...as long as i keep the room my cab is in between 60 and 70, temps usually stay around 70 to 80...and i really don't see a difference in quality unless fairly well over 85-90 degrees, at these temps i see less flavor but basically no difference besides that, at 90-105(this summer blew! lol AC broke) the buds ripen slower, end up looser, lankier, and fairly flavorless...
so all in all i haven't noticed any difference in temp at all, it would surely be more noticeable with less ventilation...im running 190 cfm through a 36 cubic foot cab...i could probably get away with half that air flow but for applications like this it comes in handy to have a wind tunnel going through your hood...
ive noticed what you notice about clones as well, but i couldn't imagine getting roots that big! lol what i consider big roots on a clone is like what is on the package of rapid rooters, they only stick out about an inch, but there are like 3 dozen of them sticking out, as apposed to my old method of throwing them into flowering when i could see just one tiny root poking out...noticing this was probably by far the biggest thing i have done for my yeild...because of which i am planning on learning all about roots this weekend, and those micortizeah dudes...if i can come up with a few tips and tricks to get faster root growth, one would think it would lead to the highest yield gains possible with tight sog...i am constantly throwing money at this cab, and it's a little sad to think that just leaving my clones in their chamber for 2 extra days i get better yeild increases than all the money i've spent pimping my cab...
Ohh man, I hate broccoli ! I personally consider it a useless vegetable
lol! i love the stuff personally, i like to eat it raw dipped in ranch lol...but my personal strain of broccoli will go back to looking dank as soon as i take pics without the hid on.lol