As both Piet and Lostracco said—go lighter than normal until you adjust. Your vascular tissues will need time to adapt to the new angle, and that can take a few weeks.
You probably already went through something similar with all your downward angles. When you first start hanging your glans will get cold just about no matter what, until your tissues can adapt and handle the increased difficulty of getting blood to flow while you are hanging. With the upward angle, it’s now even more difficult to get blood into your glans, and surrounding penile tissues, so your body must adapt further.
If the trouble continues though, you should re-evaluate & post what’s going on.