Have you tried using a little Yucca powder in your res? It will help keep drippers clean. I have tried many different dripper types and have had problems with most of them. I always use 2 drippers per plant now in case one gets clogged. I used a new type for my recent solo cup and they did not have any troubles even with kelp in the reservoir. I will be using them in my next full grow. The organic inputs you are using will grow biofilm and sludge right in the lines and filter, clogging them. Been there done that!
I got them online at Drip Depot. I am running an 1150GPH pump for 12 drippers now.
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I have been using MC a long time and several different batches and I have never had a problem with it fully dissolving? I always mix part A in a cup of warm water before adding to the reservoir. I do the same with part B and all of my nutrients in different cups. I do add Silica directly to the res an hour before anything else. Organics is a totally different animal - literally.
The problem may not have anything to do with the parts you are considering. I had the vacuum control on an automatic transmission cause the same behavior you describe, no where near the throttle body. Why don't you just take it to a real mechanic and get it fixed? Don't say money because the way you are going now it is likely to be much more expensive.