I've been working hard on this. One thing I realized more recently than I care to admit: soft plastics weigh a lot, and they take up a lot of room. So while I could maybe shave some weight by removing a few spinnerbaits I won't use from the box, the spinnerbait box is still there and still weighs basically the same. My biggest problem comes from the plastics.
I also realized (a little longer ago, but still more recently than I want to admit) that I just don't need 11 styles of a bait in 8 colors. I cover my bases for the techniques I use, try to stick to one bait that fits a "category," then carry enough of them in the 1-3 colors I might throw. For me, that's basically green pumpkin. I'll occasionally throw black, and there are certain bodies of water where I throw white. I've stuck all my white soft plastics into their own bag that I grab when I'm fishing those places so that's taken care of. A container of JJ's is something that helps me a lot too as I think the primary reason I often carried other colors was to have something different that would catch attention. A quick dip in JJ's solves that.
Just as an example: Let's say I want a beaver style bait. I don't need to carry D-Bombs, Rodents, Palmetto Bugz, Sweet Beavers, Z Hogs, and 3 others I picked up at tackle shows over the years. If I want larger finesse worm, the 6" Roboworm works great. I don't need Trick Worms and Bottom Hoppers and Plasma Tails and KVD Finesse Worms and so on. Even though I could talk myself into believing each one has a place and that I might just maybe need that Okeechobee Craw or one with chartreuse tips when the fish won't bite plain green pumpkin or black, I've never been in a situation where that actually turned out to be the case. Or if it was, I never actually switched around to try it. So what good does it actually do to carry all that stuff? I'll take an overloaded (so I don't run out) pack of one of the varieties and roll with it.
The way I convinced myself this is the way to go is to fish a few tournaments carrying all the stuff I used to carry. The difference is that I put together a single bag of the stuff I was most likely to use, basically following the one bait per category and 1-2 colors per bait strategy. Then I went fishing, focusing on the stuff in the single container. Keep in mind I had everything else so it was still there "just in case," but it became clear quickly that I really didn't need the just in case stuff. A tough tournament following this strategy was the ultimate test, and it still worked. In fact, it may have worked
better. I've since removed a bunch and found myself fishing better as a result. The obvious thing is being more efficient as I'm not digging through stuff looking for what I want or tripping over a bunch of junk. I also think it keeps me focused on the most important thing, actually finding the (right) fish. Once they're found, I still have plenty of variety to catch them.
If I run into a specific situation where things are different than expected, I can always grab that stuff from the garage and take it along.
My weakness is still when a new style of soft plastic hits the market, or maybe more generally when I have a really good day on a soft plastic that doesn't have a lot of other baits like it. I have a hard time not grabbing those and tossing them in. Sometimes I suppose it's worth allowing for a new "category" when that happens, even though I know it's almost always just hype. Hey, nobody's perfect!