Hey Noni. Sorry your baby is unhappy. It is really tough, isn't it? I understand, as my baby is still a bit of a fusspot.
As her mother, you want to do everything you can to make her feel better. As Caro suggested, you could talk to a dr about getting something for her reflux, if that's what's making her unsettled.
Its great that she's having a good sleep overnight! Congratulations!
In regard to the solids, I agree with the others, I really think it is too early and Asha's tummy isn't developed enough to cope with it just yet. I think you'd find you'd end up with an even more unsettled baby.
I wouldn't worry about her not having any more than 160ml - her stomach is only as big as her fist, so if she drinks all that, you can be assured it is full, or at least there abouts.
A friend once helpfully pointed out that younger babies still find all these bodily sensations strange. Empty tummy, full tummy, windy tummy... All these things feel really weird to her and crying is the only way she can express how weird she finds it. I found that explanation helpful when my baby cried in the early days.
GL with everything, Noni.

ETA: Just read that you've got something for the reflux. Great.
IKWYM about people having started their babies on solids early - the rules seem to change with every generation. But personally, I choose to trust the more current research that recommends babies don't start solids til 6 months or so... I think that's the most reliable info that we have as mothers to date.
I think your idea of the top up is a good one if you think she's still hungry.