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 nostr:nprofile1qy2hwumn8ghj7etyv4hzumn0wd68ytnvv9hxgqgdwaehxw309ahx7uewd3hkcqpqpcz3ajvauu39u7drqfl5ckpcxmg8srrazpwdwzr4km4yaf5plptsc0e8fe ). 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 nostr:nprofile1qyxhwumn8ghj7cnjvghxjme0qyt8wumn8ghj7etyv4hzumn0wd68ytnvv9hxgtcqyzjnd2cl0u7qzva64k7lgu4343adfdm5a4pjcxvf9pqex4e83z72qngxhfg documentation or even defaults, if it helps significantly.