Well, I don't exclusively spoon-fed, we tend to start meals giving her things to self-feed while we eat, then we spoon-fed her which is generally a pre-made baby food (not looking for comments on the fact that we feed from jars/pouches please...). She has 4 bottles of formula a day - first thing in the morning (normally around 7am) she drinks 9oz. Then around 12pm she drinks about 8oz usually. Then again around 4pm she will drink about 8oz and then before bed, around 7/half 7 she will drink about 7oz.
We've only started spoon-feeding her with most meals now because her intake when she is self-feeding is basically zero (I can tell from looking and also from her poo!), and she is already drinking so much formula I can't see how it would make sense to increase it even more especially when she is getting to the age when they're due to start reducing their milk feeds soon. When we spoon-feed, I currently give her up to half of a jar/pouch so that's around 60-75g, is that too little? However she will generally only eat that much if it's sweet puree, if it's something savoury she will usually eat about 3 spoons (if that!) and then refuse anymore anyway.
How much does your 8 month old drink in formula and how much puree do they eat? I ask more about puree as obviously with BLW you can't tell the quantities but mine seems to actually eat virtually none, and that's not enough when she's drinking this much milk still, surely?