there is much more to a cam than its advertized duration. Actual duration at .50, ramp angle, centerline, relation to the other cam, etc.
EG, I have found the HKS cams to be less aggressive than say GSC or some of the other new grinds.
Some of the older grinds were way out to lunch centerline wize so you had a crapshoot on if it would run well, but that seems to be mostly taken care of.
If you can find a set of actual HKS 264 cams that are in really good shape, that might be your ticket. Good idle, nice throttle response and better power than stock for sure. Not huge up top but you say you don't want that anyways so its a plus.
Raising the idle WILL help with aircare, but like Marke said, only so high. Close loop while testing is very helpful as well. you have to make sure you are in closed loop at least for the load they run it at. If it goes into open loop, you will likely fail.
The Triflow cams are very good for non crazy setups. Idle is as good or close to it as stock, nice throttle response and clean tailpipe(providing the rest of the setup is in order). No they are not for huge power, but for what you are looking at, they may be ideal.
In fact I may need something bigger, what with my higher redline and bigger turbo/more boost. So its possible that mine will be up for sale.
Tho, I know that the triflows can be made as big as you want.