You need to consider a wide range of changes in the game plan if you are afflicted with tennis elbow. A change of racquet is indeed a step in the right direction. I am presuming that you have visited Wilmot H. McCutchen's website (http://racquetresearch.com)
. The basic premise is that a 12 oz flexible racquet that is of even balance or headlight is least likely to harm your elbow and allow you to enjoy the game. Of all the racquets I have tried, Prokennex produces the best sticks. They are easy on the arm and produce excellent "control" racquets. There is a wide range (in the brands Kinetic to Heritage) of head sizes available that you can choose from. I played with 5g Kinetic for a long time when my tennis elbow was at it's worst but I have now switched to Type C "redondo" mid-size. This is the best stick that I have ever played with (and I have played with several over the last 30 years ....wilson ncode95, dunlop 2005, prince triple threat, prince "original", prince "thunderlight", fischer, volkl, slazenger "probraided", Head prestige classic, Yonex etc etc).
Redondo suits my serve & volley game and is one of the most accurate racquets I have ever played with. It is easy on the arm but not as easy as 5g.
Hope you find this useful