Bushmaster is about to be pulled form the market for the following reasons:
1, It is believed that it can cause cancer in humans and lab rats. Notice Phosphoload is gone?
2, It stresses the crap out of your plants. They do NOT like it.
You can water in some kelp and attempt to increase your CO2 levels. You can also try stalk pinching, bending, training or looping around the pots.