Weird organic base depressions

[grace ski]

http://weskigrace.blogspot.com/2012/01/ ... -back.html

Not sure how to post pics but I have one in the above blog..

We have a weird organic crater like thing happening. Has anyone seen or experienced this? Doesn't happen every time or consistently. As you can see in the picture one ski came out fine.

Our cassettes are clean, smooth etc. bases are clean before pressing, so it isn't debris.

We figure epoxy cured in the first layer during layup?? bad epoxy mixture??
Our press is heated to 90F so it usually sits around 104-120F as it adjusts etc

if you have seen this let us know...
Thanks in advance [/url]