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Flashing on large castings



I am having some problems with my castings that are over 150 dwt when
I am melting I see that the silver is cooling in the crucible and
not getting a uniform melt. I am using a victor #3 torch tip with
acetylene and oxygen. The problem I am getting as I have been told is
called flashing. The small flasks are casting perfectly and the big
and the small flasks are invested at the same time using the same
equation. I have just started casting since last month and usually
only cast a small quantity. I have yet to cast a big flask with

Thank you
Gary Udhwani