Question regarding nRF54L15 PHY and throughput

Hi, I have test the throughput using two nRF54L15 DKs and make them close to each other.

My result is:

1. My first question would be: the best througput for 2M phy is around 1300kbps, for 1M is around 800 kbps. If I have a TX divice move away from the RX, I first use 2M, at close distance I could get around 1300 kbps, after some distance the throghput goes down to 800 kbps. At this time, if I change to 1M phy, could I concluded and be confident that the throughput will perform well for further distance compared to fixed 2M. 

2. The second is that why coded s8 has higher througput compared to coded s2. I think I have one ticket about this but there is no feedback.

Thank you so much for your help!!!

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