bo avirett

I recently bought a Ephiphone 350 BL for aprox. 300 plus $. It is beautiful, especially the blonde flame maple sides and back. I know it’s laminate top, sides and back. I suppose it was built in the 70’s. It has a clear ringing tone and good sustain! I believe the neck is bolt on, from what I can see, looking through the soundhole. I have adjusted the trussrod to lower the action. At the 12th fret it’s still too high for my satisfaction. Any and all advice accepted.