Sounds like you did an adequate job. As for Lateral Balance.. Just have to adjust accordingly. 30 minute epoxy and some bb's usually work. If its not that much off, just epoxy is satisfactory. punch a hole big enough to put the tip of a glue applicator in the "light" wingtip. set about putting a little bit in at a time. when its almost there. Stop, let it cure up.fine tune it with even smaller applications of expoxy. when done, simply cut a nice little round patch and cover your hole. Additionally, if this isn't too confusing yet, there will be others coming along with even better ways to lateral balance a plane.