Metro, before you remove the tail, could you please do a coast down test for us ?
With talk of the BSFC being a culprit, your mileage might not improve with the 'tail, but if the 'tail had a change in aero much like previous designs, it would certainly show an improvement in the length of the coast.
( I'm not suggesting you do it this weekend, but rather at your convenience before you trash the tail.)
You, sir are a scientist. Thank you for presenting the facts as they are. Something such as this could come as a huge blow to the ego, and it would have been easy to simply avoid this re-test all together, or make up some excuse.
By presenting the facts - no matter how depressing the results - you help us all.
Thank you.
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