Jeff,
I have run seconds in many engines,most currently a Yates Headed SVO s/b Feerrddd.It sees alot of abuse.It is an IMCA motor.I have run seconds in motors such as this one all the way down to mild street cars.I personally have had no problems with ring flutter.I also had many conversations with Jim Ruggles on this topic,I feel the second is the way to go,for the fact you can not trap pressure with a gapped top ring.The second sees far less abuse being out of the flame front.As for leak downs, they speak for themselves.78 over 80 is as good as you can ask for.Someone made the comment that it will leak down good static but leak like a sive under power.If that where the case you would see unusually high mineral content on a spectro analysis.I have have never received any such results from my tests.As far as going back to stock rings...I would not.There is too much to be gained from gapless rings.These of course are just my opinions and experience.Take it for what it is.I'm not trying to step on toes,just passing along some school of hard knocks lessons.Give Total Seal a call,they will be more than willing to answer your questions.Besides that they have a cool New England accent.