Need help from an experienced auto grower

Hey guys I am thinking about trying an auto flowering strain with a cycle of around 8 weeks so that I can plant 2 then wait about 4 weeks and plant another two and keep up a cycle of harvesting every 4 weeks or so. I have grown great plants before with satisfying results but I have no experience with autos.

My setup is a 4 x 4 tent with passive intake and 5 inch outlet with a carbon filter and 400watt HPS.
I'm planning on putting another 400 beside it (1 light over 2 plants).

I would really appreciate any opinions if this is an efficient way of growing and if so what strain would be best for the room I have. I have auto seeds' auto pounder in mind but I'm not sure about space.
Also would it be worth doing a SCROG grow.

Thanks guys

i plant one a month
i run 6 mid size heavily lst'd plants but all in different stages normally