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I already had experience with deluge so that I could be able to fix that fast
it's the shitty implementation of uTP in libtorrent, good old TCP works much better
also installed autoadd plugin for deluge and downloads router extension for chrome
so I just download torrent on any site and it's added to remote deluge automatically
btw deluge doesn't have support for .part extensions so tried with that dwn cache=only & media cache=no & move incomplete to complete scheme
but that move part takes a lot of time, also sometimes I can download a lof ot temporal things from torrents and remove them on the same day, so doesn't make much sense to wait till they're moved to the HDD
it might work a bit wrong with minidlna though since it tries to index all new files
maybe I will again the incomplete->complete scheme again later
for now I've checked the "prioritize first/last pieces" in deluge, should help with metadata parsing