Printed off the 2 ducts and have them mounted with 2x Ultra Kaze's. Here's a comparison:
Old setupKaze Pull + Stock push + no ducts =
~53°New setupKaze Pull + Kaze push + 2 ducts =
63° / 59° (there's a few degrees difference between both boards strangely..)
Are the above temps expected with my new setup? I was expecting a bit cooler, especially in this air conditioned environment.
It's possibly worth noting I don't have top or bottom plates due to printing difficulties.
Edit: temps have risen to 65° / 61° now 
Seems about right with Kaze. Try it with the stock fan and undervolt it a bit to reduce noise & power usage. I went back to using just the undervolted stock fan now and it uses less power, creates less noise, and cools better than 2xKaze. I go based off the temperature sensor though - the 2 fan layout would cool more evenly and might be cooling better than the sensor is reporting.