Welcome to the forum. Bummer on the sprocket needing a reverse install. Even though Chain tensioners are not needed or wanted they sometimes help the chain clear the frame... ya never hear that one. You should have luck with reversing the sprocket though...Like Chaz said The gremlin shake out is always present and takes time and is a learning process that never ends really but once done you will have smooth miles. Its a hobby for us that do enjoy always tinkering and improving. I've been going with my chains so they don't need a tensioners and then I add the one that screws to the engine case its self and has a skate board wheels as it quiets the whole works down and takes up even the slightest slack that is always present and sometimes changes as the wheel revolves slightly. Also prevents having a too tight pedal chain for absolute perfect tension and trouble free safe miles. Might be worth the 40 bucks they cost.