Your LO is just the same age as mine. She is also 8kg.... big baby. She is not a big eater (5-6oz) per meal.... I tried solid a week ago, but her reflux just keep pushing the cereal out. I've tried to add rice cereal in her bottle, but with the bigger hole it almost chocked her and she swallowed a lot of gas. She became so gassy that she waked up several times instead.
A doctor told me by adding cereal in her bottle will make her gain more weight, because the volume is the same, but more calories. I decided to add solid later, when she is ready.
I do cluster feed, and then move DF till 12ish (I get some sleep first, and then wake up to DF)
If you want to try out solid, do it during the weekends...