At the risk of being shot down in flames here.....
Declare a Mayday. You'd like to think that the 2nd engine will function nicely, but you don't know that. You need assistance (or at least the awareness) from ATC. Nothing, trust me, NOTHING cuts through background noise in a tower and on a frequency quite like the M word. I know this because I have missed a wishy-washy "oh I have a bit of an engine problem" call on two occasions. "Pan Pan" or "Mayday" GETS YOU NOTICED! And gets the help you may need in place. If you subsequently decide you don't need it..... that's your call.
Don't hesitate, is my advice. I personally would rather it that way around than potentially miss another one.
Safe flying,
Foxy