I'm primarily a singles player that is playing doubles on a 4.0 league. Doubles faults have been an issue (to put it mildly) for years so I've just been hitting kick serves in matches. In my last match I made almost all my first serves and my kick was actually causing trouble for our opponents and I was able to hold serve easily. Since I'm more confident w/my kick serve now I'm thinking of taking a bit more risk w/my 1st serve and also want to mix it up more. I've always heard "take something off" or "put a little more spin" on your 1st serve, but my normal 1st serve I'm not blasting as hard as possible or hitting completely flat and I still miss it quite a bit. What am I trying to do technique wise for a good doubles 1st serve?