What exactly do you mean that it drops to 2800-3000 rpm and then takes off? I guess I am not seeing the problem here as the rpms are going to drop to that after a shift. Is there a bog or power loss feeling after each shift? The rpms dont really say a whole lot if there is an issue. Most guys turn up the TCC apply speed tables in the pcm when going to a higher stall speed than stock. Do you have any trans codes in the pcm since the install? Did you change gear ratio and not adjust the pcm?