If I still need to crank my t-bars, but have only a 1/2" left between bumps and UCA, will reindexing let me get more height before I get to the minimum space between bumps / UCA's (1/2")?

I turned the t-bars until 1/2" bump stop clearance, I'm at normal rake, 1" lower in the front, no shackles on the rear yet.