I reckon you could make (or buy) a Bahtinov mask if you have not got one. You can very quickly get good focus with such a mask. I also remember using free software that allows you to fine-tune focus with Bahtinov mask.
In the past I tried using numerical indicators in Nebulosity - it used to take me way too much time to focus in this way and with Bahtinov mask I could/can focus MUCH faster and more precisely.
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