... I have been using a Hoya circular for my 24mm 1.4 II but is leave half the sky light with a really dark pacth in the middle..
Uneven polarization is a natural phenomenon, unrelated to the type of polarizing filter used. The area of the sky perpendicular to the sun shows the strongest polarization effect (i.e., results in the darkest sky). It is easy to determine which part of the sky will have the strongest polarization: form a letter L with your thumb and index finger, then point your thumb to the sun... your index finger will then point to the sky area with strongest polarization. Since wide angle lenses show so much sky, it is inevitable that you will notice that some areas are lighter than the one with the strongest effect. There is no way to avoid it (with super wide-angles), other than minimizing the effect by not turning the polarizer all the way (to its strongest-effect position).