I see what you are saying about the teeth on the implant bridge being lower, but honestly, I think it's fine unless they physically bother you. You are being more critical of yourself than others will be toward you. Is the bridge something that can be removed and remade or is it permanently fixed in your mouth? If fixed, if it was me, I'd just let it go. I do have 2 implants next to each other (not a bridge but two single implants) on the bottom left that are smaller and shorter than my other teeth, I'm probably the only one that notices. Well the dentist probably does too.
Ask your dentist if there is a chance that you could bite down and damage the taller teeth, especially the one right in front of the implant bridge. If that's a possibility, I'd ask for the implant bridge to be remade.
Seriously you teeth look very nice! I hope you get more opinions.