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HPL What is important for optimizing speed in time trials is body position. The height of the bullhorns on your bike i.e. the seat to bar drop will not allow you to get your shoulders low enough and your head out of the wind. You could lower the bars down as much as possible and then bend your elbows on the bike to lower the torso.
Even if you change the bars to drop bars, your position will be too high. If that is as low as you can go, so be it. Time trials are more about making every pedal stroke count and you can do that from any body position.
IMO, the bullhorns are not acceptable for group rides and mass start racing. When I was a supervisor at the velodrome, we would not allow mustache or bullhorn handlebars on the track and of course, many fixed gear riders like mustache handle bars. You need to change them to standard drop bars. The reason is that in close quarter racing, you can get tangled with other riders with bull horns. With drop bars, one rides in the drops which is a safer position and allows one to bump other riders or get bumped without mishap.