Wow, you have done a lot of experimentation!
Shure seems to be the most common cartridge used on this table so I think you just may not be a Shure fan.
I just put a V15-II with a brand new "NOS" VN15E on this table and it sounds great. I shimmed the cartridge to optimize it for single record play, and set the cartridge all the way up to the front of the carrier sled slots which kept the stylus tip in the same spot as the M75E stylus.
How do you align your cartridges?
I bought the angled shim for mine and it gets the bottom of the cartridge parallel to the record, and then fine tune tweak it with a VTA level, and also use the MOFI disc.The shim is at a 15 degree angle. It makes it much quicker for me. I usually wind up having the cartridge all the way up front, or about 1/3 back.
I also have an original overhang gauge and will match it up depending on the cartridge, then just square it up with the mofi disc if needed.
What I wound up doing when I got back into records was buy and sell a bunch of tables and carts to try out. I've slowly focused on a few tables and each has it's place for me. I like the Dual 1019 and the (new to me) Miracord 50H for more rock and dance types of music as it seems punchier and fast to me.
I use my Steve Frosten customized AR-XA for more of my Sinatra type and R&B music and for my clinical listening. He's also doing an Ariston RD-11 Superior over that will double in place of the XA.
The idler drives I did myself and they were fun doing. They aren't as quiet as the XA, but are fun to play. I use the idlers more than the belt drive,so that's the reason I use the MC on them, and a custom built SUT. They sound so much more open and better than a MM does.
I have also used a Baerwald and Stevenson protractor on the tables with good feedback from them.
Don't get me wrong, the Shure's sound a lot better than a lot of other cartridges out there, they just aren't as bright as I like. I wouldn't have any issue if I could only use one.
I'm curious to hear what your MC sounds like on your 1019.
P.S.=I've also used the Denon DL-110 on the table and wasn't a big fan on it as well, I'd rank it lower than the Shure carts.