Your tubing, 1.25" x .120" vs. 1.00" x .060" (my tubing) is approximately 2.3 x stronger in compression and tension, and 2.7 x stronger in bending resistance. My failures were fatigue related to the rear tail section bobbing up and down which induced cyclical loading combined with a bending stress caused by attachments. After the first tube failed, I apparently continued to run which accentuated the stresses applied to the rest of the structure. Use a nice high gloss paint and inspect the frame regularly for cracks. I've basically come to the conclusion that no one could have predicted the failure of my first tube, the vertical unbraced strut that supported the rear section. All designers eventually run into situations leading to failures that weren't predicted. That's when you add another tube or make the existing one stronger.
Tom