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20 ft of hose can increase the amount of r134. Are you using an ac manifold gauge set with high and low hoses? You can monitor high side readings with temp charts if you see any increase in pressure but it sounds like you need more refrigerant.
Could you scan and post the instructions and material packing list?
I am going down this road soon but I am piecing my kit together as I have most of the components.
Most units require a few ounces more for drier & condenser than oe filled compressor. Instructions should gave stated total...