Congrats! That's an awesome TV!
I was just yesterday starting a play through of BS The Legend of Zelda: Ancient Stone Tablets on my 60" plasma tv, and tweaking the settings in my OSSC to adjust the scanlines - I found that using 8:7 aspect in 2x mode with 4:3 output and letting my screen scale to 16x9 makes for a softer horizontal scaling with my RGB modded 1-chip SNES mini. My brother came over and said what are you doing? Why not just play the game? It looks like old CRTs looked.
I booted it up in the arcade test cabinet where we test and tweak our other setups being made for-sale on a 32" CRT.
"OHH! That looks a lot better!"
I've now bought a large pile of scalers and transcoders that might improve my image on an HD screen (Framemeister, XRGB3, Various Startech & Altoma, Behas Bros, Cypress, Arcade Forge, Gombez) and tweaked them all, upgraded the firmware etc. So much expense when I should've just kept my SD content plugged into CRT screens. None of that tech can make as good a visual for 240P SD content as a CRT.
I don't have a 4K screen, so with the right algorithms someone might make a filter that can almost do the stuff - I've looked at the multitude of shaders and filters where everyone tries to make a 4K screen approximate the weird glow through 2 layers of dust that a low-DPI-CRT once made in the 80s... but why bother None of them have 0 lag?
I still only test and play important games on standard low-end CRTs modified for RGB, and they come free or under $50(cad) whenever I need another.
I do love the output from CRT VGA monitors, and have a couple of low-end PVMs, but whenever I see a PVM of any appreciable size, I again see the sharp edges/cutoffs that look unnatural for the games I want to display.
I think the optimum size is between 16" and 27" for RGB input in a CRT, and the DPI is optimum to the age of the game being played (before prince of persia, even old VGA monitors didn't really show scanlines ot 400p in consumer monitors) and PAC-MAN never had prominent scanlines (tho I wish he did - looks so good).
Someone on Vogons made a great comparison of DPI in an older 14" VGA CRT, and a 17" from a few years later. Both of these are superior to the consumer CRTs of the time, and the scanlines on higher end larger mid 90s SD tvs are way more pronounced as those are even more advanced. Since I grew up on those tvs, I have an affinity for the higher end CRTs my friend's parents were on the cutting edge of. I love Sony's 3D comb filter.
I've been reposting this pic for a couple of years now (sorry, no source link - google reverse image search it to Vogons forum). Does anyone have more like this amazing macro CRT photography?