2 solid door reach-in freezer trouble

[jayryu]

I've got a service call to a reach-in freezer. The freezer keeps the temperature of abt. 40 ~ 45F and compressor run continually. The data is as under.
compressor : coplaweld FJAF-A056-IAA.
Refrigerants: R404a
Box temp: 46.5F
Low press.: 17 psig
Low side(compressor suction) temp: 69F
High press: 240 psig
High side temp(after receiver) : 99.3F
Condenser in/out air temp: 90/106F
suction superheat : 88F, subcool: 2.5F

Checked TXV with sensing bulb dipping warm and cold water and found suction pressure changes.
I have thought first it is shortage of refrigerants and charged about 2.0 lbs more.
But before and after the gas charge the operating data was not changed almost at all as above. I don't know what to do next.
I hope there will be some solution.