I'll take a look tomorrow, ended up doing something else important that came up. If you don't care for attack but want HP fire still, then
Attack: HP_E = 30
Set that as your egg's IVs.
I have a feeling the best way to do this is to
Take the exceggcute and breed it with a quiet male parent. Get the egg to be quiet + DW ability + female, should be very easy. You can be very lax on IVs.
Then take that new exceggcute and breed it with the egg move male parent.