Looks like all you might need to do is to remove the spout, if you can get to the screw, then adjust the flow.
Then again, your accordion flex pipe is really a poor choice, so maybe start over?
I installed that exact same faucet on my parents home. My pressure didn't drop as you experienced. But that faucet is designed to have a low flow. My parents are happy with it. They paid $99 for it from a major home improvement store.
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