I like dotted grid as well. However I like Pilot Juice Up 03 gel tip .3mm. They are very precise, write in many conditions, and I’ve never had one run out of ink.
Pilot V5 RT refills fit into the Everyman Grafton pen ($35)
I used that for a while but found the pen a bit too large.
Nowadays I either use an Energel [2] or the classic Pilot V5.
[1]: https://everyman.co/collections/frontpage/products/grafton-p... [2]: https://www.amazon.com/gp/product/B0776M8VY1