CLN is doing some improvement, do you have the last version? They do some work related with that in this one I noted that "many" nodes are setting some high fees, for example... I think that 1500ppm could go through without issues, but if you set it in the order of 300ppm or less it's going to fail a lot. What ppm are you using? do you use some MPP (multipath payment) configuration?

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I use latest version (25.02, I just checked). I use default btcpayserver-docker config, I did not change any settings (besides activating xpay as per suggestion of @urza ). I'll look into settings. Are there some recommended settings for MPP and fees that I could try out somewhere? If it helps significantly, it might be added to @BTCPay Server documentation or even defaults, if it helps significantly.