leave the shroom it'll attach if/when it wants - i doubt it will pull off more if things are good
frogs are funny - too much current and they are bushy but not long, too little flow and they usually expand more but don't seem as happy, as for light, mine seems to not care much i've tried higher and lower light doesn't effect much - though the more actinic the greener the tips will be. best thing to do is to find a spot with mod current and light and then leave it in there for a long time (as much as a month) and see what happens. most people move them around too much and they never get happy
as far as flow/light in your tank go:
flow = power heads - i know some think you need to hide them and they are an eye sore but the health of the tank prevails in this case. i have a lot of them and make no attempt to hide them cause i like to clean them now and then and don't want to have to rearange rock to do it. hiding a PH behind a pile of rock makes no sense to me, but thats me, i want them where i can see them and monitor their performance. closed loops are nice but not as flexible in shifting flow to where it is needed.
i use to use only MJ's but two years ago decided to try some high flow pumps and now believe it is the way to go: if i could afford vortecs and tunzes i'd own them but i can't:
i just bought a couple hydors and they are not bad - obviously i can't speak of longevity yet but they seem OK and seios i've had for almost 2 years and i like them as well.
as far as regular PH go MJs on a natural wave are awesome but have to be carefully aimed in small tanks - i have MJ's more then 10 years old and still kicking
your lighting "prob": can actually work for you with some creative scaping lower light/flow shrooms and lps to the bottom outsides and high light to the center top