dilt when you say blowing their cookies do you mean they are blowing out the end of the supply stop or that the lines themselves are blowing a hole in them?
Welcome dilt1. Hope some of these suggestions might help. No fun coming home to a wet house. In my opinion, the additionial cost of the flex supply lines is well justified, considering the peace of mind you get. Please come back with any questions you have or feel free to jump in if you have a suggestion for some one elses problem. All ideas are welcomed. Good luck ~ shao