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Hey mate something is not right here.

Double check your powder is actually 2206h.
Double check your scales accuraccy/calibration.

Here is data from ADI in Winchester brass.

you can see they...

bit of plastic hose is all I use.

As Thar said try a drop tube, even 100mm long will make a difference and pour it in slowly.

That doesnt sound right,I can get 52gr of 2208 in.

Whinny brass must be thick!

Id go up in half grain steps, load 1 of each from starting to maybe a full grain over max.
Shoot all bullets in order at the same target marking each shot and examining each case for signs of...