So most of those buts are what I like to call fine detail bits. They are great for cutting really fine details and cleaning up edges but don’t remove a lot of material.
Large Flat endmils are great for hogging, like 1/4” or 1/8” (6/3mm) end mills are great for parting and removing bulk material. Also please take note that Ryan’s starting speed and DOC are very very limited as so many build vary in quality. Some of the other members like Doug can give you some better recommendations, I have only just started testing my machine but for example I made This the other day and I know I could have cut faster but I was cutting cleanly at 25mm/sec (1,500 mm/min). That is also without having my drivers tuned as I sourced my own parts.