I'm thinking that you have probably already put this beer into motion, but my 2 cents... I just brewed a pale ale about two weeks ago that had 7/8 oz lemon zest added at flameout. I was unsure of how much to add so i just guessed. After about 10 days fermenting i checked for gravity and flavor. The lemon flavor was very pronounced. Almost a flavor that i associate with the smell of floor cleaner. Don't misunderstand, it doesn't taste bad. It's actually quite good, though it is a little strong. I expect that the flavor will diminish with time. I put the beer in the cold basement to give it time to settle and clean up a bit until i have a chance to put it in a keg. This was in a 5-gal batch.
Edit: I also had a locally produced "Lemon Drop" pale ale. I am assuming they call it that because of lemon drop hops (waitress was unsure). If it was the lemon drop hop, it was a little underwhelming. It had plenty of lemon aroma, but zero lemon flavor.