Whoa 300k... dude that's pretty decent I've always heard the HR's were tough. Soo yeah as for getting your moneys worth you have without a doubt. I am only at 18k and haven't had this issue yet but if I were in your guys shoes I would do these things in this order. I have always been a believer that if your trouble shooting start off cheap and work your way up to the expensive stuff.
1. Get some electronic cleaner and hit the MAFS
2. If you have access to a smoke machine use that to find if there is a vacuum leak. if you don't, and want to stay cheap about it get a cigar and some sort of tube or like 3 or 4 toilet paper rolls tape them together take some puffs off it and blow into the engine bay look for vacuum leaks (anywhere you find it pulling air into the engine)
3.Clean the tb's and intake filters
4. change out your spark plugs
Sorry if I seem like I'm repeating the same thing that's been said but I would do that order of maintenance before I started really slamming money into the problem.
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