It's only been within the last year that I jumped into the Festool world and for the most part I've been really pleased with my purchases.  The idea of a system has fit well into what I do.  However, I've never really been impressed with the dust collection capabilities of my CT22.  I've included a picture of my Kapex after making 5 cuts in solid stock that was on average 3/4" thick and 2-3" wide.  I'm using a 2" hose that's 10' long and my 22 is on full suction.  The dust collection that I've got with my 1400 has always been okay.  I don't notice any appreciable dust when sanding but the inside of my 150 has quite a bit of dust in it when I'm done.  I wouldn't be skeptical except for the fact that many have touted the dust collection capabilites of the whole system.  Are my expectations too high or could my CT22 not be up to par.  Incidently, it seems like there is hardly any suction when I disconnect it from the Kapex.  Certainly not enough to use it as a vacuum in the general sense.  I've changed the bag and knocked the filters.

I've tried that.  The suction is all the way up and I just banged the hose around this afternoon.  No real difference.  Do you have any of the sanders?  If so, do they typically collect a lot of dust on the inside?

I do have some fine dust from sanding finishes but generally all the wood dust gets to the vac. One annoying thing with the festool hoses is that they tend to collect dust at the end of the hose so when you pull the hose to pack up a bunch of dust falls out onto the floor you just vacuumed    There must be some turbulance or a vortex created where the hose connects to the vac.

I've got the CT33 which is essentially a CT22 with a larger bag.  I have the same dust problem where the hose connects to the inlet.  I just leave the vac running and pull the hose off far enough to clear it. 

I can't help but think you've got a "furball" somewhere in that hose.  Does the vac labor more when you attach the hose while it is running?

If it is that obvious that it is lacking suction, try calling Festool for service.  They should stand behind it.

Check the suction with NO hose, if it is weaker or stronger than with the hose on you will know where the problem is.

Both of my Festool vacuums have really powerful suction, so I would also agree yours is experiencing difficulties of some sort.
Suggestions above are good ones.

The only time I have this is if I cut wrong on my KAPEX, e.g. lower the blade onto the work but haven't pulled the slide far enough out so get lazy and cut a little pulling it toward me before pushing back.. that tends to bring the dust forward. If I start at the front pushing the blade back it works much better.

Stating the obvious, but a fairly full dust bag also causes a significant drop in suction

I had a similar problem with my 33, which I use regularly for sanding, sawing and cleaning and typically works great.  There was little to no suction at the end of the hose and at the vacuum itself.  I had gotten lazy and the bag was full, but even after changing there was low suction at the hose.  I checked for clogs and couldn't really find anything but eventually after fumbling around for a while a mass of fine dust (really a lot) comes out of the hose.  I think it must have gotten stuck at a point and accumulated more dust and density, but was still soft and kind of hard to find.  The 33 is fine now and like I said, I use it for cleaning and its great, I do have a little residual dust in sanders but generally speaking, with a ts55, ro150 and cleaning attachments the collection is great.

Something is wrong with your vac.  The CT22 is the most powerful vac I've ever used.

Jason