Last plate pressure tests repeatedly fail

Hello. Maybe someone here has already dealt with the following problem.

For our single-family house on a hillside, we have carried out the foundation recommendations required according to the geotechnical report. There is 40 cm of recycled gravel on rocky ground, installed and compacted in two layers. The static plate load test required by the general contractor at two points failed the first time. Recommendation: further watering and compacting. Said and done. The second attempt also narrowly failed. More watering and further compacting. Unfortunately, the third attempt failed today as well. Attached are the values of the plate load tests:

First attempt:
EV1: 99.2 MN/m²
EV2: 36.1 MN/m²
EV2/EV1 = 2.75

Second attempt:
EV1: 45.1 MN/m²
EV2: 118.4 MN/m²
EV2/EV1 = 2.61

Third attempt:
EV1: 45.3 MN/m²
EV2: 118.4 MN/m²
EV2/EV1 = 2.61

Value EV2/EV1 must be less than or equal to 2.5 to meet the requirements.

The vibrating plate is a 500 kg Wacker DPU. Is that usually enough, or does heavier equipment have to be brought in?
How was it for you, and what can we do?

well, the undefined nature of recycled aggregate could be the cause. For example, we were not even allowed to install it in the first place. Our BP Bauer would have outright rejected it (he informed us of this as a precaution ;-). I am in favor of recycling, but when you take a closer look at the mess and the amount of organic material in RC aggregate, compaction can definitely become problematic. Of course, I am not a clairvoyant, but why don't you talk to those involved about the above-mentioned circumstance and find out their opinion on it.

... The indefiniteness of the recycled gravel could be the cause. For example, we were not allowed to install it at all.

What did you use instead?

We had installed KS gravel. Please take meaningful pictures of the RC gravel (close-up, overall, high resolution). Does the vibrating plate "float" while compacting the ground?

A friend of mine had the same. It was due to the recycling gravel. It simply wasn’t suitable for compaction. It was removed and replaced. After that, there was no problem at all.

I am absolutely not an expert in this area, but does recycled gravel even have an "approval" for such matters in this case? I somehow have in the back of my mind from our construction that the general contractor said that one or the other thing may not be done with recycling...