Gentlepeople, I am a new member. Been lurking since last Fall when I started playing tennis regularly. I am 42, 189cm (6"2 1/2). I now play with the Wilson Juice 100s strung with the Federer blend at 56/52. I am right handed and I serve with a continental hammer grip. I have a very hard and fast flat serve both down the T and out wide on both courts that hits the back curtain about chest high in an indoor court. With practice I have upped the percentage to around 40%. My first serve is practically un-returnable to most of the folks I play with. They usually stand way back, by the back curtain and just try to get a racquet on the ball and get it in play. I ace around half the time when the first serves land. I win a majority of the ones that the opponents do make contact. I have a good pure slice/top-spin slice serve with a 10-15% reduction in pace on both ends as well using the continental grip. I can get the ball to move 4-7 feet laterally (discounting angle) from where it lands in the service box as measured at the point of impact at the back curtain. I can get more movement if I use the eastern backhand with a 20-30% reduction in pace. I use the top-slice as my second serve when I am leading. It is still not a safe serve for me. I get it in around 60% of the time and win a majority of the points when the serve goes in. These two serves have come relatively easily to me and in time I think I can improve the percentages. I sorely need a good twist kick serve or a pure kick serve. Things have become a bit predictable on my second serve and I am having to rely placement to keep my opponents guessing which reduces the service percentage when under point pressure. Here is where things stand with my quest to develop a good kick and then hopefully a good twist kick. I have no issues getting a big kick. I can get it to bounce anywhere between 6 feet and 14 feet depending on where the ball lands and how high the ball goes before it lands, when I get the ball to drop in the service box. The problem I have is for a 95% error free rate, I have to drastically trade off either i. how hard I hit the ball on depressed trajectories while still getting the ball to drop into the service box. When I do this, it kicks up about 6 feet and gets to the baseline about stomach high at about half the pace of my flat serve and dropping quickly. My opponents usually drop back and bit and handle the serve without much discomfort. For some match ups, the ball sits nicely in the wheelhouse and I get a hard ball back. ii. the distance it travels after it drops, if I hit the ball mostly straight up in an elevated trajectory where the ball goes very high drops in and kicks up at least ten feet, but is waist high and less than half the pace of the flat by the time it reaches the baseline. This confuses my opponents initially but they adjust quickly wait for the ball to drop and then take hard cuts. I have recently learnt the mechanics of the twist top spin somewhat. Using a continental grip, I can get the ball to move about 3-4 feet (discounting angle) with a 10-15% reduction in pace to my flat serve, in a direction opposite to my slice as measured at the back curtain (while serving from close to the center of the baseline). But the percentage is woeful, about 20%. The wrist motion at contact does not come as easily to me, as the top slice and I miss long. The high speed videos out there (that were pointed out in related threads) give me a reasonable understanding of what is happening from the back and the front. But what happens in a twist/pure-kick when it comes to the side on view, especially the mechanics that control pace, is not very clear to me. I assume the delayed pronation adds to the pace. When I try to exaggerate that aspect I do get pace while retaining height, but I miss long. I would appreciate any suggestions to help me achieve a good high percentage kick/twist kick serve.