after F2POOL REACHES 50.6% Litecoin Hashrate many of there miner has been switch to differ mining pool so where they go
here is detail on it http://betbybitcoin.com/warning-breaking-news-f2pool-reaches-50-6-litecoin-hashrate-51/
as many of not still implement segwit in there mining pool ..so do the pool owner don't want to implement it or they don't want to use segwit ...
Not sure as many forum admin also delete any topic related to segwit not sure they they what want to discuss on this ..as segwit have many new thing make your pool more efficient ..so why not mine in segwit enabled mining pool ...
Hope pool owner will implement soon ...if you want to mine in sigwit enabled pool you can try http://sparkpool.org