I would say keep beebe where he is. after Tackle, center is the next most important position on the OL and he made great progress. a guard is more easily found than a center.
I would venture to say putting Bass in that spot would be a good option. he is not the strongest, but technical and plays solid with minimal mistakes.
If I would shake up the OL, I would let steele walk. his dead cap and cap savings even out. move Guyton to the right side where he played in college. less pressure on him. Move Smith to LT, where he was very good....and move Bass to his spot, where he is protected between smith and Beebe or go as far as drafting a LT in top 12.... yeah we got guyton last year, but lets not forget, how Tyron solidified the LT for so many years and how important it was to the offense.
if we move Smith out, then draft a guard in the 2nd, 3rd or 4th round. or perhaps sign one in FA......like the guy from AZ who played for Adams. there are a few options available in FA that won't cost much.