I have in lost finding solution for 2 solid door freezer. Usually the freezer kept around -10 F, after defrost problem fixed it doesn't go down under 6.5 F. I have changed the tev recently but no changes. The data are as follows.

compressor : AJA2425ZXA
gas : R404a
box temp: 6.5 F
suction p: 21 psi
compressor inlet temp: 25.5
discharge p: 233
receiver out temp: 97.3
condenser inlet air: 83.8
condenser out air: 96
super heat value: 38.6
subcool : 2.2
sight glass : clear
compressor ampere: 7.5
condenser TD : 15.7

I am thinking about inefficient compressor. Is there any idea? What is the solution?
Please help me, I am in really severe headache.