Any changes in Prefix/Sufix coding

I know the recent patches have increased the quality of prefix and suffix on rare items and MIs. After spending a good amount of hours farming. After 1000s upon 1000s of rare dropping especially MIs, I have not seen a single double rare affix roll. I understand that they are rare but my sample size is fairly big probably closer to 10000 MIs of all kinds and I am very curious if with the recent patches and changes if something was changed with the affix assignments. I have gotten a lot of double magic affixes or 1 rare and 1 magic but never double rares.

When I craft I am able to reproduce double rare affixes and it doesnt take 1000s of craft to see one more like 100 or less. So I was wondering if any other player have found double rare MIs drop recently after the last 1-2 patches. If not, maybe there is a coding error that is preventing double rares from dropping and limiting MIs to 1 rare and 1 magic.

Any thoughts