Switch landings are one of the hardest things for a binding to hold. The ability to do this well is what makes a freeski bindings different from others. However, even freeski bindings have a limit. Charts work great for normal skiers, but when you get into heavy switch landings, you need to make some personal choices.
The first thing is to definitely check your forward pressure. If that is off, it throws off everything else.
Then if this is all perfect, and you want to stay with this binding, you need to ask yourself what din you are willing to ride. There is a scale where you want the binding to release nicely in a twisting fall to prevent any injuries, but you need them to be tight enough to hold on a nose heavy switch landing. This is why people like super high elasticity bindings like FKS and Jesters, because they will allow a good amount of give when landing switch without releasing, allowing you to ride a lower din and still stay in the binding. However, even with these bindings you need to find a balance of what din you are comfortable putting yourself in. Higher is better for staying in on switch landings, but you risk injury when catching in a twisting fall.
I am not sure what to suggest. Yes a higher din will keep you in better then tip heavy, but it may not be something you want to risk. You can look for a binding with more elasticity if you are willing to buy something else. The choice is really up to you. No chart or person can tell you what is best for you.
Now I am not saying you should do this, but if for some reason someone wants to try increasing their din a little, do it slowly. Go up 1/2 a number and try it out for a few days and see if you still release when a bit tip heavy. Chances are only a little bit will be needed to make you happy, and will still keep you safe. But also remember, you can tear you ACL with your din at 3. Skiing is dangerous.