Having only one testicle asd you already know has no efect on test level, since feedback loop makes it work twice as hard. THe issue here is, as you use AAS that testicle will shrink, so whaen you stop AAS, and the feedback loop says MR. Ball turn back on, there is less surface area to produce test. This problem will be compounded for you, as you only have one. Therfore, HCG will be a must for you on cycle, as well as post cycle. One of these other guys will advise you on dosage, but I'm telling you it is a must.
