Do you wax your car often? It may not be that you are waxing to much, but that you didn't remove all the haze. I haven't used Blitz before. The P21S that I use is wipe on wipe off. Pretty easy.
Go over the parts that are still hazy/oily with some quick detailer and a good microfiber or cotton towel. That should hopefully help a bit.
As a general rule, remember that "less is more" when it comes to waxing. Hope this helps.
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