I her ya on the 66s. I installed a set last week replacing some Elixier pre-lubed rounds and the windings felt much coarser. String noise; Ack! I've never used the liquid products other than the ones that spew from my facial pores.
On a positive note, Rotosounds have about as coarse a feel as it gets. So if you're able to become comfortable playing 66s, you'll be able to play pretty much anything else without complaint.