The GOP is trending badly in the US Senate. Philosophically. Even Mitch Daniels of ID suggested removing "social issues" from the GOP platform - without a peep from RNC leadership.
The RINC/GOP is still controlled by the Rockefeller elites. As long as they are, they will remain much of the problem, saboteurs of conservative candidates, and enablers of RINO candidates.
Why do you imagine the RNC selects candidates for Congress? Is that because the Democrat DNC does?
The two parties operate quite differently. The Democrats march in lock step and base selections on seniority and contributions from special interests. They are very Stalinist. The Republicans have a much more open and locally based selection process.