I have read that you are using cast V2. I do not.
I use cast V1.
I suspect that V2 is a similar but less transparent. And so it requires a longer exposure to UV.
In my case, 1 - UV Cure until the blue color disappears.
The correct position and size of the cast.
This is the basis for the casting process.
Next recommendations concern the casting process.
After filling the mold with the sand, do not use the device to remove wax - see - (Has anyone used a steam dewaxer on the castable material? )
Sleeve with the product should be raised to be the possibility of exhaust ventilation.
Does the company foundry applies this principle to the resin cast?.
Next processes are dependent on the nature of the product and should be applied by casting.
Good luck
Sorry Google translator.