The phrase "a more proficient" is correct and usable in written English.
It can be used when comparing levels of skill or ability, indicating that one person or thing has a higher proficiency than another.
Example: "After completing the training program, she became a more proficient speaker of Spanish."
Alternatives: "a greater level of proficiency" or "a higher degree of skill".
You could hardly ask for a more proficient and persuasive guide than Mr. Herrick.
He also, in a corporate environment that might fill some with apprehension, became a more proficient designer.
The Stockholm Initiative on Global Security and Governance, issued in April 1991, articulated the desire for a more proficient system of global governance.
And though he and his business partner, Robert Duffy, have frequently bridled under the bureaucratic control of LVMH, Mr. Jacobs has become a more proficient designer because of that control at Louis Vuitton.
2. Irish QB Everett Golson became a more proficient passer as the season progressed, and he has the ability to create big plays with his arm and his feet once he gets outside the pocket.
I don't know of any research that supports the opinion that video games actually help you develop the marksmanship skills to be a more proficient killer.
Independent filmmakers are, as a group, more proficient than they were a half-decade ago, but critics who mistake this polish for a commercial sellout are wrong, Mr. Redford said.
Edwards said that he thought Tupa was a little more proficient in directional kicking, but that Parks has a very strong leg.
Perhaps the president is hoping that Mr. Boehner will grant him some concessions since the speaker is a much more proficient golfer than the president.
Benteke thrives on crosses but there were hardly any of note and there were other times when they needed him to do a much more proficient job at holding up the ball and bringing other players into the game.
