Based on the following article Heart Rate Drift your HR drift is above 5% hence the pulse you start the test with; is not your AeT pulse in my opinion.
I don’t know how you found the initial HR of 135 for another test, but in my case I used MAF calculation as the starting point for the test (180 minus your age) as I had Aerobic Deficiency. This number may or may not be your AeT HR but it helped me to minimize the number of tests (although AeT HR is not fix and can change from day to day and will move upwards with training so the need to repeat the test in the upcoming weeks is a necessity also).
My take is to take another test with a lower starting pulse (definitely lower than 147) and try to stay under 5% drift
More experienced participants may have other tips as well, hope this helps