Sounds like he is getting plenty of food. No need to worry about him not eating finger foods. My daughter took quite a while to get to that point. Stage 2 foods are fine. And, not that he has teeth and after he has had all the stage 2 options, you might switch him to stage 3. The difference is that stage 2 is still single ingredients (if I remember right) and stage 3 is a bit 'chunkier' than the other two stages. If he can handle those foods, then it will be ok to move to some softer finger foods like scrambled eggs (though some say to wait an extended period of time before offering eggs, but I don't remember how long).
Does he get anything else to drink? It sounds like he might need more fluids. At 8 months of age, my daughter was still breastfeeding several times a day. A pediatrician once told me to breastfeed first and then offer food so the baby is still getting plenty of nutrients from the breastmilk and then is supplemented with foods.
As long as he is gaining weight and reaching milestones, he is probably doing just fine. I'd just add some fluids in there.
God bless,
A.