I use my CT22 regularly in combination with my CS70 saw (2200W), and my Kapex (1600W). So I went and checked the Dutch festool site, and I thought you were mistaken the wattage allowed to be connected, with the wattage consumed by the vac (350-1200W, depending on setting). Then I checked the manual, and it appears that there a different rules for a lot of countries. For most EU countries it's 2400W on the socket of the vac, for CH and DK: 1100W, for GB 220v: 1800W GB 110V: 500W!!, for AUS: 1200W. The rule for the US is 2400W connected load, so if the suction is set to max: 1200W at it's lowest: 2050W.
So to answer your question, I have never gone over the maximum wattage, but only due to my location: at home in Belgium, or at jobsites in Holland. I am no elektrician, but I would guess that if you know your wiring and breakers are up for the task, the vac could handle the higher wattage tools with suction turned to max.
To be on the safe side and to follow the manual, you could use different circuits for the tool and the vac, but you'd lose the remote trigger function, which seems unpractical.