Gas is indeed inexpensive. I can't see moving to a different engine without moving to something that will allow me to spend 80% less per gallon on fuel. Yes, the wing loading will increase, but the plane lands well now and I don't expect the additional weight will change that significantly.
From everything above it seems the consensus is that the DLE-20 will perform better that the .91. I appreciate the insight.
As to the comment about Zenoah - the closest analogy to the DLE-20 is $50 more expensive and 10oz heavier.