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		Standard height is 0, other heights are offset from standard.
If the compressor is getting lazy it will take longer, if you have a freshly rebuilt compressor, why would you not try it? Takes 5 mins to swap...
When the indicator shows that it is at offroad height, what is the live value from the 2 rear sensors? 
Gav - if you have changed bushes/balljoints ect you should go through the calibration procedure - it sounds more painful than it is.
	 
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Lifting
	
	
		Hi  did  you fix problem
I  have same  Billy
	 
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		Does sound like compressor tired or cutout switch not allowing to full pressure.
The back airbags need more pressure than front for same height. So maybe thats why yours will lift front but not back.
Ive rigged up 4 individual wheel air valves under bonnet and mucking around I've found my old wshop compressor at 110 psi will easily lift front high but not back.
	 
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		Yeah, you need at least 140PSI to get the arse off the ground.