"If" the camshaft were wearing , or any of these components were wearing , the clearance would be opening instead of closing .
The only time clearance closes , is when the valve stem height goes "up" or gets taller . As when valve seat or valve face wears .
Don't worry about this for now .
Please make sure you are taking these measurements at TDC compression . Remove the spark plugs so you can rotate the engine . If you have a bike stand , get the bike up on the stand and put the transmission in high gear , use the wheel to rotate the engine to get the piston on TDC . One TDC will give you valve overlap , the other will give you what you are looking for . Adjust these valves and go to the other side and repeat the procedure .
When you are finished , Take a break , then recheck your work .