Oh boy, very interesting post. Not that it matters as opinions are just opinions but I will leave mine here as well.
I agree with Grizzly, Judges have the right to judge anything at anytime because that's their concept, they are strict, they are powerful and many times they might abuse their power for the sake of so called justice for the tiniest of reasons, so yeah heading up to Gold like a hobo just to clone might cause you problems, answer to a Judge with an attitude might cause you problems.
Now I understand there are different kind of criminals, loudmouths and discreet types. Both of choices have to do with what YOU want to RP. A loudmouth will be famous, will be called names good or bad and his/her appearance will be known, if walk open air proudly in any sector, not just Gold with the high security, don't ask for protections, things more likely will happen just because of your presence. You suddenly change opinion and want to be more discreet, well time to change your cloning plans, disguises are risky? Did you know that just like in real life you can change your appearance? Change your hair, change your eyes, put lens on them, put make up, walk and talk differently, dress like a corpie, confuse them! Now if roleplaying is poor from both sides(Player's and GM's puppet) and they still understand you just because it's you, then yeah, if nothing works I suggest the Black Market cloning with the VERY high risks.
I won't refer it as a problem for discreet criminals, if they do their work properly they won't even have an issue showing their faces. Those criminals won't attract much attention to themselves, they will do their work even as loners, they will still RP everything and get away with their discreet ways. On another note GMs shouldn't be forcing the players to RP any other way than the one the player has decided for him/herself.
One small suggestion I have, just like GMs get a Judge NPC to check a Mixer at Gold sector then with the same way get a ganger NPC to check a fancy rich looking guy checked in the Mix. (If not done already, I might have just missed it.)
To sum up, I don't see high unbalance between the sectors, maybe only the difficulty of cloning for loud criminals but all in all it has to do with RP choises that should be treated accordingly from both sides.
That's all folks.