Well, it's not quite the sooner the better especially if you don't know how the balding will progress, you can end up with shock loss after the hair transplant and especially if you are not taking any treatment like finasteride, you can end up loosing a lot of your natural hair that was left and will have to do a lot of other surgeries to compensate that loss... It's actually better when it at least stabilizes a little, especially of you are not using any meds... More and more transplant doctors actually refuse to do the surgery if you are not on finasteride before and after at least a couple of months before and at least a couple after...
As for the clinic and the doctor, i took a look at their site and before and after photos and i must say that you are one of their best transplants, i'm not impressed of their results, even do i have to admit that they took a lot of aggressive balding stages, but it seems they don't fill the area to good i think they want to do limited donor area coverage and the results show that... Except you, i think i saw one more that i can say it's good made, but i'm not impressed, i would spend a little more and opt for a little better and known transplants surgeon that can deliver a more natural look, especially if you are on a more advanced Norwood stage and have a more aggressive hair loss... If not, you might end up spending years and money trying to repair what a not that experience doctor made and have a lot of transplants that were unnecessary...
But i have to admit, that you were lucky
, i hope it lasts as much as it could last !