Based on your calculations and the fact the weather here is poor which gives me plenty of time,I had decided to strip the the stabs and look inside. I was horrified , another flight would have been the last. The stab has always had some flex and iv found this on all my models,so I was blissfully unaware .
Iv decided to replace them and stiffen them and introduce the measures you suggest regarding the down/side thrust. With the mods it should prolong its life. Im not a bold pilot, I tend to flying around gently (no frills) which might also contribute to the extended life of my bear. Thanks for the advice, I will let you know how it all pans out