Oh I remember this well! I don't think your milk supply is dwindling, it's just that after b/fing for 7 weeks or so your body has adjusted and is producing roughly how much your baby needs. This is just in my experience, from what I remember, I'm no expert! When your baby has a growth spurt, it takes your body at least a day or two to start producing more milk so whatever you do it'll take time. The only thing I can suggest is to try expressing at roughly the same time every day (and as you say, morning is best). Are you using the little freezer bags you can by for expressing? I used to keep one in the fridge and add to it during the day - for example if baby only fed one side during a feed, I'd express from the other side and keep it in the fridge, then freeze at the end of the day.