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I was in a similar situation on my '84 Carrera about 3 years ago.
MSK, I think you have two basic options. First, you will take it back every year for AC service, or second, learn how to fix yourself and service it every year.
The 134 leaks through the hoses with no apparent leak. I bought the flourescent dye and could not find any leak until I realized the stuff was leaking out through the pores in the hoses. Buy a good AC service manifold testor/ recharge system ($60). Also a vacuum pump from either Napa Auto or Harbor Freight ($40). Buy a set of the green o-rings. Change the o-rings and then evacuate the system, pull a vacuum for at least 45 mins, then recharge to about 120 psi at 2,000 rpm. You need a strong shop compressor, preferably a dual motor one with a large tank.
The way to see if stuff is cycling throught the system is to check both the high side and low side pressure. A sight glass is not really needed. The critical factor is you want enough pressure and refrigerant to get liquid at the expansion valve.
I bought the Pro Cooler and I get 40F vent temps on a 95F day. But I have to evacuate and recharge every year.
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