Thanks for writing into our forum. I’m not sure why you were having trouble posting but I am making my reply here for the benefit of both you and others.
Your first test looks like a lot of variation in HR and pace making it a bit more suspect. The second test on the other hand is much more consistent for both HR and pace and shows 3.65% drift. I feel more confident that this is the one you should rely on. I feel that you should use 150-153 for your AeT (top of Z2) for now and test again on 6-8 weeks.
What was your perceived exertion? Did this feel crazy slow and easy? If so then that’s very very good indication that you have ADS. Or was this strenuous and tiring for a more than a day after?
I hope this helps,