Well here is the problem.What ratio of wax to oil do you use?
All my recipes and notes were lost in the fire.
I'm thinking a few grams per litre if memory serves me.
But my memory is faulty to say the least.
Start there and see.
Otherwise add a couple grams to improve stiffness.
And a teaspoon of mint per litre .
Or what ever scent you like.
Stay safe
Bill284