I have seen the "standard dose" for balls not to get shut down but IMO is all BS bro science, whatever strange substance you put in your body it will cause a reaction, in this case your testis will notice that they no longer need to work beacuse you are injecting the substance they produce so they will shutdown regardless. Thats just my humble opinion. May be someone with way more experience can say otherwise, but then again it all depends on your body, we all react different.

what are your stats and cycle history?

I don't have a direct answer for you but the two requirements, being on enough juice to be effective and still not have balls shrink (without being on HCG on cycle) are to me contradictory. Either you take some meds (for some illness) tht lowers your test levels and you balance it out in which case you balls won't shrink OR your test levels are normal in which case any extra amount will tell the balls to produce less. Now, how much balls shrink vs. Test produced (taking into account ur baseline & injection) I dunno but you should get your levels checked and then see BUT any relevant amount of test needed to build muscle would be in a certain reasonable amount. So, for me the requirement you're having isn't feasible. I mean, you could inject just about enough test ( based on your baseline level) so tht balls dont go completely on strike but is tht worth going through all this in terms of benefit you'd gain... Dunno. Just thought id give you this angle to think bout.

also if you're looking for ballz not shrinking from a cosmetic only point of view than the only difference you'll notice is tht ballz dont spend as much time in the bag as they used to when they hung fuller you're girl would notice it the first day she grabs a hold of tht Easter bunny!