When you wave, you are hitting the closest appropriate lvl wild. So by waving, you are maximizing the number of hits you make per hour. Drop rate is random and it doesn't matter if you have hit 1 wild 100x or 100 wilds 1x. People think by hitting random wilds and getting one they have a technique, but it is all luck. Same luck that lets 1 person get an egg in 1 hit vs 1 person getting it in 100 hits.