OK, here is my update to fix the opposing roll syndrome when appling rudder input. This should effectively take care of any opposing roll no matter what your AOA is and if you're pulling postive or negative G's. This fix should be considered as a BETA, meaning that you want to save the orignal data.ini for your hornets prior to moving this one into your hornet folder untill EricJ approves of this fix and recomends it as an official over-write for the current FM.
Now when I mentioned that this should be the replacement for all the hornets, this is originally setup for the F/A-18F. So you will want to delete the section for the WSO for any A, C, and E variants that you intend to use this fix for.
During experimentation, and making adjustments and corrections to data table values, I wasn't able to correct the opposing roll syndrome when rudder input is applied. So right now, it is a strong hypothetical assumption that the Third Wire engine takes into account of the positon of the pivot points. Due to how the "V" tail of the hornet is setup, rudder input, causing lift on one side of the slanted tails can induce a roll towards the opposing direction of yaw.
What I did to fix this is use the ailerons and elevators, without using their nodes (so it doesn't look like anything else is being used to assist the rudder), to operate during rudder input to counter act the opposing roll. Even though this stops the opposing roll, the aircraft will roll towards the driection that you would want to yaw to. I couldn't find a "perfect" balance in between to keep this from happening. However, I found this roll to be evident with other "V" tail aircraft (with significantly more dramatic role rates with rudder input) and some single tail aircraft (F-16 and F-4) when applying rudder input for them. So I'm not going to consider it as a serious issue.
I hope this takes care of all your rudder input needs.
Report any issues or negative side effects other than the ones that I've posted.
FA_18F_DATA.rar