Seems you tried any possible ways to cure your preEj and still you not satisfied with the result on most of them.
I know it's hard to dwell on that condition, been there too. I tried PolyCover c1imax Delay Spray every time I need to use. Then consulting to my Urologist bout this problem and I ask for something that can permanently cure it.
Motivation, self-control, physical and diet will help you regain control of ejaculation. Now with the help of sprays and some Medication prescribe to me I am now enjoying 30 mins of sex performance in my partner.