Urethane can certainly help you control reaction, but there's a few things to remember:
1- Wipe it off religiously. The oil sits on the cover. No soaking in with these, at least it takes much longer.
2- Play straighter lines, because typically urethane won't let you open up the angles very much, due to it's slower response time to friction.
The Super Natural is possibly the exception because it's not 100% urethane. If I understand correctly, there's some reactive resin in the mix.