Damage taken strategies(multiple CWDT usage)

It hit me that you could cover all encounters by having CWDT setups at different levels,well 2 specifically.One low level with AoE spells attached and a high level with a single target spell setup.Is this a viable strategy that maximises output,assume I have the space for it.

No, it isn't.

Or rather, that depends entirely on what you are planning on doing. Are you going to be just standing there tanking damage, while your CwDTs trigger?

If you are, then lowlevel CwDTs are not all that efficient for damagedealing purposes, because each spell in a CwDT has an individual cooldown of 250ms (or its own cooldown, if it has one), and when tanking damage at high levels, especially when tanking the tougher bosses, you'll be tanking a lot more damage every 250ms than is needed to trigger a lowlevel CwDT, so you'll be better off if all your CwDTs are high level.

On the other hand, if you are not going to be facetanking everything, then lowlevel CwDTs look much nicer, since when you aren't bottlenecked by the cooldown, the lowlevel CwDTs have a nicer ratio of damage effectiveness to damage required to trigger.

For an example of a facetanking CwDT setup based around max level CwDTs, see this build:

http://www.pathofexile.com/forum/view-thread/1271604

(They haven't all reached max level at the point of the character shown as an example, but it is the goal.)

I am using Doedre flasks to force DT so if the CDWT is too high these won't work.I am grabbing as many life nodes as I can(also life replenish).At the moment most of the time just one flask will set it off where previously I had to use two consecutively.I think I'd need more life than is possible to max out CWDT.

don't forget the damage penalty cwdt has up to level 19. a low level one is useless for damage dealing if you had that in mind.

have you taken a look at the afk discharger? http://www.pathofexile.com/forum/view-thread/575998
makes the best use of the trigger gems.