Couple of things: as macz said Freeze12 is not HC.
Next your charge is either very low or it is contaminated. You cannot tell the % charge from the pressure.
The low side pressure switch cuts the compressor out at +/- 18psi, so that 6 psi number is troubling.
I think your plan to evacuate and recharge is a good one. Put *exactly* 2-12 oz cans in. Factory charge is 26 oz. 24 is as close as you can get,'unless you find some really old 14 oz cans that sometimes show up on eBay.
Good Luck!
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