I'm using the Eberron action points and I'm not familiar with the action point system you are referring to so at first glance I am generally disinclined to use it. Some of the alternate ways to use action points at the SRD seem very strong, and I'm not sure that the challenges are calibrated correctly to take that into account. I've already opened up a whole lot of alternate material, after a while it gets too difficult for me to keep track and make adjustments to scale each encounter appropriately.
FYI they are calibrated to keep you well up to your neck in danger, typically ELs are 1 to 3 levels above you, but that is designed to get your group from 5th to 9th or 10th in only 46 encounters, rather than the typical 70 to 80 balanced encounters for a party of 6.
So yes, its designed to be scary. Some of the challenges are downright unfair. Those that are I have fixed. I hope. This one is very tough but I have faith that you will get through it OK, although you will probably be bloodied quite a bit. Your already off to a good start.
I will give you a hint, you are expected to rest after taking out the poison dusk and blackscale camp and before entering the portico of the temple. So I'd throw everything you got at these guys as far as daily resources go. Particularly the guy who just shot Rosa. There is an alternate encounter that you can do, but I wouldn't recommend it under your current shape.