Unfortunately for you (and many others), your fast twitch muscles and corresponding 5s, 10s and 20s power outputs are the least trainable energy systems, physiologically speaking.
In layman terms: You're either born a sprinter or not.

You can and likely do have room to improve your form, however.

In addition, another way to address your problem is to raise your threshold and power outputs at longer intervals, such that you can respond to said attacks with more force and more frequently.