No advice but just wanted to post as your situation sounds similar to mine in some ways. :hugs:

DD is only 2 weeks old but I'm struggling with supply issues. She is not back to birth weight and only gained 5 grams in the last three days after losing weight the first week we were home. She does seem to be generally settled and has plenty of wet/dirty nappies. She was never jaundiced and has always been happy to feed as far as I can tell but we also went home with advice to feed then top up with EBM and formula. I had a day of expressing with no breastfeeding while in hospital due to nipple damage but insisted on putting her back on the breasts before we went home. (Attachment issues are fixed now and nipples healed.) My milk took over a week to come in even with motilium. DH and I stopped the formula top ups within two days of being home as we were never convinced she was really hungry just unsettled in the evening as many newborns are. We also stopped using bottles and syringe feed her EBM if we do top her up. I've tried to pump between most feeds but had a lazy stretch for a couple of days after I thought my milk had come in. The same as you I average 10ml per pumping session. I'm really hoping to avoid formula top ups as I can see it being a really slippery slope to the end of breast feeding.

How do you decide when/how much formula to give? I find it so hard to decide if it's a normal evening grizzly few hours or if she's hungry.

Massive congratulations on what you've achieved so far. All that expressing and topping up is a heap of work and you're doing an incredible job.