i think you are on the right track with hps for bloom ..thats what i always used ...but for sure those led have alot of potential for vegg
o and bro we got the same system right ....rainforests 66 unit .....i never had a good bloom with those ...but it is the best veg machine i have ever used ....
....check this out ...and ive been doin it ......u get a nice fat vegged plant from rainforest and then you can transfer the whole 6inch net cup with hydroton ...i take off the little coir top that sits on top of the pebbles and i basically plant that right into a normal pot ....soil would work ....i use coir and basically the idea here is using that rainforest to boost plants veg cycle so they have an awesome bloom
here is a pic of one such transplant ...and some that went to buckets (those are nice cause it also uses pebbles ) and i dont have to dig out pebbles ....not that it is hard ...they all stay together