I do not have the experience of working with these exact materials but I have a recommendation that can help you solve this issue if no one else recommended something better.
Do you guys have a vacuum oven in your institute that you can use? If so, I suggest you try mixing all materials with a stirring speed and then use the vacuum drying oven. Please use several stirring speeds and oven times so you find the optimal one.
Please let me know if you get results, it is interesting.