Does seem like a very slow feed, but as above with no details on your machine it's hard to know... sounds like the tool is chattering a lot. Is it really only 5k rpm?

You can reduce your tool stick out a lot there... ideally you only want enough of the tool sticking out to clear any fixings and get as deep as the bottom of your work piece. Obviously you don't want to insert it into the collet deeper than the shank but consider using shorter tools where appropriate as this will reduce tool flex, reduce chatter and minimise any runout issues.

I use mist coolant and air blast when machining alu and that works great for me.

You are also using adaptive there but you don't show your axial engagement (it's on the 4th tab). You can reduce this to suit the rigidity of your machine while also upping the Depth of cut to get more of the cutter length engaged.