Analysis of your gage R & R data
Here is summary of my findings from your data.
1) Gage R & R is 23.06 %. It is not bad. It is desirable to be lower than 20 %. This means that contribution of the measurement system is square of .2306= 5.3 % and remaining 94.7 % variation is coming from part to part.
2) 99 % of your measurement system variation is coming from repeatability and only 1% from reproducibility.
3) Number of distinctive categories from your data is 6 against required 5 minimum
4) If you wish to improve R & R with minimum efforts, you may recheck reading for highest repeatability variations. For example, part 4 shows high variation.
Arvind