The sites I use for the highest quality (up to 6M bitrate) both have premium / paid links
This one uses wushare
This one extmatrix
But for either of them you can use leechall to bypass those links, you'll definitely have to watch ads and go through some fake articles but in the end you get a direct download link, it allows you to use 5 GB daily for wushare and 3 GB daily for extmatrix, it's up to you if it's worth the hassle to get some high quality JAVs.