Double check when you change the cam installed position. But as I recall, advancing the cam (going from an intake lobe installed position of 110 ATC to 106 ATC) will reduce intake piston to valve clearance, but increase the exhaust P2V clearance. If you are running 1.5 ratio rockers, it should be around 0.023" change. But the lobe profile can be different than what I am used to.

Let us know what numbers you measure.

I check this when I "map" a cam. And I see around 0.015" lobe lift change with 4 degree advance, measured atg +/- 8 degrees of TDC (that is where min piston to valve usually occurs).