So we need to buy 3x PSUs to power this thing?
I don't think you can use only 2x PSUs. According to bitmain's product info
Do not connect more than one PSU to the same hashing board!
If you have 2 PS with enough +12VDC power output, use one to power 5 blades the other to power 4 blades + controller + the FANS (per the published specs it looks like Bitmain might have gone to higher-airflow Delta 4200RPM fans on the S5+ vs. the 4000 RPM fan on the S5, so probably 14-16 Amps JUST for the fans, possibly as high as 20A.)
Customers must buy the set of three modules as one unit; Bitmain is not selling the individual modules of the S5+.
This is VERY unfortunate, there are folks that would be interested in a "same form factor as the S5" 1/3d version of this.
the so called best ever cgminer never neither increased my earnings nor reduced my electric costs over the bitmain fork
Limitations of the hardware mostly, possibly a DRIVER update might help a hair but there isn't much you CAN do to "optimise" an ASIC-based unit once it's in production without a complete redesign of the hardware itself.