36gal hex powerheads and placement

[mallery8p]

I've had my 35gal hex tank up and running for about 8 months now and don't think I'm getting the right flow and have some dead spots in it. I currently have a 380gph I believe and a 180 gph powerhead. Would these be enough to get the flow right and what would be a good placement for them.

 

[saltyphish]

Pics would help but ideally you will just have to move your powerheads around until you hit that sweet spot. Aquascaping will play a big role in placement.

 

[mallery8p]

For some reason it won't let me put on pic on here but all my rock work is on the back half of the tank and about half way up