NEVER attempt to fly an avoidance manoeuvre based purely on a TA unless you are 500% confident that you have visual contact with the traffic that has caused the TA, and an actual risk of collision exists.
Wait for the RA and fly the vertical solution that is generated. Also be aware that TCAS azimuth information on the VSI is not 100% reliable. Your `home made` avoidance turn in response to a TA or perceived interpretation of proximity traffic azimuth info COULD WELL MAKE THINGS WORSE!