Successful castings from clear resin using ceramic shell

I’ve made I don’t know how many of these for this group, I’ve been milling them in green wax like matt wax, I have rarely had a problem, out of say 30 final pieces, you can see where I put the sprue on the side there , I know that’s why I got the break down in the lettering, I was desperate for a good casting and was trying to get some air flow up there was my thought, so this is where I’m at with all this,
as I’m writing this I found out that I need to make 30 badges for a local police department, I hope this issue is resolved soon or I’m going to be in real trouble
Paul