I would reposition it height wise in the tank first to see if that helps it, you wanna try and keep it about half way up the tank. The deeper in the tank the more pressure there is forcing the bubble back together.
If you have the diffuser in the back of the tank try putting a sponge on the powerhead and then position it directly in the upstream path of the diffuser so it suckes up the bubbles. Doing so would have the powerhead chop up the bubbles and spread it throughout the tank.
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