Just a quick note to say hi! I also had a strata valve fitted for nearly 4 years I have just recently had it removed because of the problems it was causing me every time I had problems they would check the setting & find it was not constant it would cause an overdrainage problem same symptoms as you & more as soon as it was replaced with a different type I felt really good again sooooooo happy now its out of my head. I dont know if this is of any help ? hope so.It is hard enough to cope with hydra as it is but when the valve to is problematic it makes things unbearable. Good luck