Low head high suction fixed orifice?

I have a 15 year old Coleman Heat pump that is acting a bit unusual. About 3 months ago the A coil was changed out as it had been leaking for some time. As far as I know the system has been running fine this entire time. Last week it just quit cooling. I hook up gauges, and I have high suction low head. I take the temps across the reversing valve and they are within 2 degrees of each-other (83). That tells me it is bad valves in the compressor. So I changed out the compressor. I still have the same problem. So I look into the history of the unit to see that the coil had been changed, and start to think that the orifice in the new coil is to big, and allows to much liquid through. This is what I think, and I am seeking other opinions for as I said the system has been running fine for 3 months, and then one day not. I am just a bit baffled by this. Any help or advice would be nice.