Could you skip the clear and use solid mojito? I know it would be cost more, but you don't have a huge amount of decoration and the cracks don't seem to follow the decoration, so the problem may be the mojito over clear.
I find more cracking problems in really big hearts with vertical holes. The mandrel is a heat sink, then it looses more heat because of the crease. Each lobe of he heart is still large, so they retain more heat. Before putting in the kiln, I try to equalize the heat in the piece. The larger they are, the harder it is, IMO.
We often think of cracks as either incompatibility or thermal, but I often wonder if inconsistent heat doesn't aggregate incompatibility. Just my opinion though.
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Kathy
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