Would it be better for the miner if i remove all the casing and run them without it ? cooling measure
Unless you have a huge heatsink to put on the backside of the circuitboard, I would say absolutely not. You'll do more harm than good. The casing IS the heatsink. If you want to take further 'cooling measures' then replace the stock thermal paste with some good quality non-conductive/non-capacitive thermal paste and add some small heatsinks to the tops of the chips and add a fan to blow through the chamber.
This is what i bought
http://www.aliexpress.com/item/Cooling-kit-72pcs-For-Bitcoin-Miner-Antminer-ASIC-180GH-s-DIY-Aluminum-Heatsink-Cooler-Reduce-About/1661008735.html
Low profile enough to keep the case on. I should have them soon I hope.
And then I got some pk-3 thermal paste and cleaner to redo that backside.
Should help a lot. I have no idea why they are cooling from the backside. The PCB doesn't transfer heat very well and the chips are getting super hot in the stock setup.