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@Chopsicle
Although it’s super strong, the top stitch thread plays to the visual and decorative. It’s more loosely spun and ‘lofty’ than a dedicated tightly-spun strong yarn.
One trick you can try is simply double threading the machine with standard threads. Two reels on the top, threaded through machine and both through same needle. Regular single thread in bobbin, and adjust top tension if needed.
It won’t give a stronger seam to tear/tension forces, but it will to abrasion and stress on the topside where the double thread is ...mix thread colours and twist in the feeding sections if you’re feeling frisky!