It is high resolution middle speed when design 10bit SAR comparator . latch comparator is low resoluation large offset. Usually, I use two low gain high speed op as pre_amplifier then connect latch.
The pre_amplifier amplify the signal large enough to latch comparator latched.
We can cancel pre_amplifier's offset, and the pre_amplifier's output is larger so the latch comparator' offset will not affect the final result.
All those discussion is not base on your circuit, as I don,t understand your circuit.
The above content only for your information. Detail you can reference some papers or book.
You can search them on internet. As I am on business in foundry of Taiwan about 2 months. There are not related material in my notebook.