I like to go 5 or 6 serves going to the same side on a double bounce serve, either heavy backspin or dead. Keeping them guessing on the spin but going to the same side makes them cheat up towards the table, and if you do it to their back hand they cheat towards the backhand to keep the ball in front of them. Then on either my 6th or 8th serve I will do a kicker spin wide to their forehand, they are usually cheating up so much by that point that I can ace them with the speed. Aces in tt are soooo awesome.