Building a stash while working

I’ve been EBF (pumping and nursing) for five months and back to work for three of those. I am starting to panic because my stash I built before going back to work is almost gone (I stored a little over 100 oz. before I went back to work). I can easily pump throughout the day but only get between 9-10 oz. and he takes 15 at daycare. I pump once after he goes to bed and can get another 3-4. Anyone have a tried and true pumping schedule that nets them what they need? I’m also always nervous that if I pump too much/too often I won’t have enough when he nurses. Thanks for any advice!