According to today’s road bike ramp test I have 22 more FTP than my last Tri bike measurement at the start of the plan, which is what the whopping TSS from the group ride was calculated with. It’s significantly less stress now that I’ve recalculated 
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Going to re-test on the Tri bike soon as suggested, who knows, maybe I’ve just made 22w of gains! (The chances are vanishingly slim, but you never know…) Might regret doing that ramp test when I’m in the pool with my club in a couple of hours 