8mo is still very early to be getting to grips with meat
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DS didn't really manage it until 10 or 11mo, when he had enough teeth to chew the pieces! He managed fish a bit younger though, but that is softer to eat.
We have
never had any success with stage 2 or 3 foods
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He'll eat stage 1 purees with a bit of baby cereal mixed in, or all sorts of finger foods, but nothing in between
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Going to try him on mashed potato and mashed up sausage casserole for tea tonight, but am not expecting much success..
If you want to get more protein into him, blend the chicken into a smooth paste with a bit of water and add a tsp of this to his stage 1 puree, mixing well. This did work occasionally with DS, but too much chicken and he'd notice and refuse it!