I only used my kapex once for cutting aluminum, I used a nf blade I had for my makita ls1013, which has the same arbour holesize, but a slightly smaller diameter. The dust extraction worked fairly well, but there were still little chips on the table, which I had to brush away after every cut, for not scratching the powdercoating on the next piece.
The kapex has variable speed, so you can cut at a slower speed and avoid the need for cutting lubricant.
But I prefer using my CS70 if I only need to make straight cuts, the table is easier to clean, (I was scared that the chips would get in between the turntable mechanism of the kapex); and the cs saw has an airfilter for the cooling air, so no chips can get into the motor.

  to the fog.

i presume you are cutting small cross section extrusions like a window frame etc.
i wouldnt use the kapex , for 2 reasons.
1 st price of it , you dont want to ruin it.
2 nd you say you are 50 / 50 aluminium wood, so you swap blades regularly, i would use your old dewalt  or buy another saw dedicated to the aluminium.

I have cut quite hefty aluminium profile (45x90mm) and lots of it with the Festool aluminium blade with any problems, I didn't use extration, just a paint brush to wipe the swarf off the cutting deck and then hoevered up at the end. No lubricant used, just took it slowly and used 3 as the blade speed