When is the surf actually decent in West Bali?

I know it's been asked 100 times, but im a loser so im asking again.
Every time i go to the break on Berewa, Oldmans, Batu Bolong etc.. its just mushy and/or dumpy, never clean lines or the mini barrels i've seen in the pictures.
When is the tide the best in these spots? What parameters should i be looking at in the forecasts to better improve the chances of me having a halfway decent surf?
Cheers.
4FL
Every time i go to the break on Berewa, Oldmans, Batu Bolong etc.. its just mushy and/or dumpy, never clean lines or the mini barrels i've seen in the pictures.
When is the tide the best in these spots? What parameters should i be looking at in the forecasts to better improve the chances of me having a halfway decent surf?
Cheers.
4FL