Gravity loss is a far bigger concern than drag for "reasonably" aerodynamic rockets. It sounds like you could be more aggressive with your gravity turn, especially with a starting TWR of 2.0. While you can get into orbit more efficiently in terms of ∆v, you probably will be better served by not having so much dry mass in engine weight. I have found that a starting TWR around 1.3 to work best for me.
Have you experimented with different launch profiles? I have done some experimenting and found a fairly aggressive gravity turn to work best.