Some of you might find this useful. I went ahead and created a comparison page between my real life tests and the calculated results for weapon AR.
http://pvp.aodb.us/ARDEF/display.php
Note that if a calculated result is higher than 100%, the difference is not included in the total at the bottom. I have no way of seeing real life test results of 114% land rate, so those differences would throw off my average, so I count those as a 0 difference.
The total simply adds up all the differences and basically tells you how far (on average) my formula is off.
5.06%. Not bad. :p
(If anyone requests it I can do the same for my nano tests.)