You are what I call a “turnover addict.” You mistakenly associate limb speed (i.e. turnover) with moving fast without realizing that their are other factors which come into play. The slow feeling you get when you run “bouncy” is pretty normal for turnover addicts who start to run correctly. The reason you get this sensation is because your flight times and distances are longer as a consequence of increased vertical force application at ground contact. Ignore your gut instinct and trust that you are running faster. When the correct running mechanics become natural you should really see some improvements.