do any of you guys who have a flip-flop have chainline issues? For example... its straight and smooth on the fixed but once you flip it, it sounds like your chain is going to derail??? If so, what did you do to fix this? Should I put spacers on before I screw the fixed cog on to try and get the cog-to-spoke distance equal to each other? Or will that strip my cog/hub?

Maybe get a wider chain? When I'm on freewheel, I have the same problem; I flipped back to fixed for now (forever?). I don't know if this causes any big problems -- maybe just faster wear on the chain and gears?

For those that need a visual: