You might have already noticed this but in the Professional Implants shop you are not limited to buying pre-made implants from your Prof terminal only. You can buy pre-made implants that you can use from any of the Prof terminals and many times you will find a better cluster/implant configuration for the way you have developed your character.
Treatment is based on Intelligence (60%)--shift right click on any of these and it will tell you. So if you are in need of a few extra Treatment to get that implant in, remember that for every 3 Intelligence you spend IP on you get one Treatment-actually if you have the IP to spend you can get a lot of treatment this way. The other perk to this is that a bit of extra intelligence will keep ya from doing this all the time and instead you will just know that to open the door you only need to turn the door knob