Do it more precise or more precisely?
Those two phrases are not equivalent. You can say "make it more precise" or "do it more precisely." The first uses an adjective, the second an adverb.
When you poll "do it more precise" on the NGram Viewer, you get a big zero. No instances.
The Viewer is a flawed tool to begin with, but if you don't define your terms within a narrow enough scope, you'll get gibberish.