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By plunking, do you mean casting from the bank? If so, that's not going to work. If you mean fishing from a boat, that will do the job but you will probably need more weight to hold that plug in current.
Are you plunking in the Columbia or the Cowlits? You should at least be using a Spin n Glo/shrimp attached to your mainline then sliding the Kwik Fish down like you already described, just be sure not to have too many hooks in the water at once. The plug will only go to the bow your line makes and won't make it to the weight on the end of your line. You can spread your gear out and cover the water this way. You shouldn't use round weights as they will roll across the bottom and into a snag or someone elses gear. Have an assortment of 6-24oz pyramid weights. There will be a lot of drag from the current, you need to stay put. I would be nervous casting heavy weights with 25lb mainline, especially mono. I use 50-65lb braid. What kind of rod are you using? I use a 10.5' extra heavy. Have a sturdy rod holder and loosen your drag, a fish can rip your rod off the bank. Use bead chains to reduce twist. A good product that makes thing easier is the Oregon Tackle 360° plunking spreader, especially for multi rig setups. Bring a comfy seat and the BBQ, plan on spending some time at it. Plunking can be agonizingly boring sometimes so it pays to have some sort entertainment along. Good luck!
So I have 3 rods and I don't think any will work well which I'm worried about. I just got an ugly stick gx2 salmon/steelhead rod 10-20 pound, medium heavy, 9 foot with 20 pound berkly fire line. I got this pole for drift fishing. I found another cheap pole in my shop from many years ago. It's a ready 2 fish brand, 8 foot, medium heavy 12-25 pound line it has a reel that can hold lots of line (more than the gx2). And my last pole is an ugly stick tiger 7 foot medium heavy 30-60 pound. Where I am getting confused is the line weight ratings on the poles. If my poles are rated 10-25 pound am I even able to use them with 40 pound line? Would a high pound braid work? They are all spinning reels except the tiger stick. I'm fishing the Columbia I'm Vancouver Washington. I also have a ski boat with rod holders that can go on the Columbia if bank fishing won't work for me
Unfortunately, your rod selection is not ideal for plunking and/or anchor fishing on the Columbia. I have seen guys using spin gear while plunking on the Cowlitz but it is generally a bit heavier than what you described. Generally a 9-10.5' heavy to extra heavy rod with a level wind reel is preferred. Some serious Columbia plunkers use 11-13' rods but that is not required. You do need a rod wih some backbone to handle slinging those heavy weights out in the river. Some people use a kayak to "ferry" their gear out from shore but you still need a rod that can bring that gear in when its time. Don't worry so much about the line rating on a rod, just about everyone who is fishing braid is over fishing their rods line rating. A good rod that is reasonably priced is the Berkely Air IM8 in the 9.5-10.5' length paired up with an Abu Garcia 6500 or Okuma Coldwater reel spooled with 50-65lb braid. You can do any type of Columbia salmon fishing with this combo from plunking to trolling herring/flashers to anchor fishing with plugs without breaking the bank. If you are in the Vancouver area, jump over to one of the Fisherman's Marine stores in Portland or Bob's in Longview and ask for some info on getting set up for Columbia salmon fishing. They should be able to give you plenty of info.
