Update: I looked into this A LOT. I found that I can get a custom valve (similar to video above) from a shop or just piece together myself. Cost for a setup like that was more than the summit valve (also in this post), which seems more elegant so I went with that. It was about $250 for both sides of boom, but it's backordered till 1 week of march (fine with me as the tilt bucket I want is 4-5 weeks for production).
Yes I agree the L47/M62 backhoe a bit too jerky even versus the L3301 BH77 that had 1 pump for everything (it would slow down A LOT if you tried three functions at the same time). IDK if it's any better or worse than a mini-ex though...those are really bouncy, tipsy, and jerky. It seems to me they should have put an extra pump on boom, instead of swing. You don't swing and move the arm/stick at the same time. Normally you curl, move the stick, and arm at the same time, so I don't see the point for having an 'always fast swing.' Of course I say that, but realistically, when digging you're swinging a lot and the time it takes to perform the swing is a big factor in how fast you dig... it takes more time to swing and position the spoils then it does to grab them so maybe there is some reason to it. With an always fast swing, you can dump your spoils as you swing back to digging and visa versa. Either way, once you get used to it, it performs well.