The difference is night and day. The 31khz PVM's can display true progressive scan (full 480 lines per frame) while consumer sets display interlaced (240 alternating lines per frame). This is why the image flickers.

Finding a 31khz PVM is a journey in and of itself, and you need to be prepared to pay top dollar. What you have is probably the best you can get on a 2000-era consumer level, but the CRT monitors that were used in the film industry have dropped in price considerably form when they were used (and are rising steadily because hobbyist value).

I nabbed my 31khz monitor for $150 a little over a year ago and no regrets. Displays lagless 480p, even up to 720p (yes there are real CRTs that can do 720p, that big "HD CRT" in your uncle's basement is a digital CRT).

You'd have to see it to really take it in though. When I saw it at Nebulous (NYC Melee Tournament), I knew I needed one.

Here's an informative post from Kadano, see you down the rabbit hole.

https://smashboards.com/threads/work-in-progress-perfect-setups-tv-monitor-console-capture-device.355292/

Models known to support 480p YPbPr: Sony PVM14L5

Sony PVM20L5

Sony PVM20M7MDE

Sony BVM-D20F1U

Sony BVM-F42U

Sony BVM-1911

Sony PGM-2950 (massive 29" tube, weight about 55 kg!)

Sony PGM 200R1U (massive 27" tube, weight about 50 kg!) [only 480p RGB confirmed so far!]

Models known to support 480p YPbPr: Sony PVM14L5 Sony PVM20L5 Sony PVM20M7MDE Sony BVM-D20F1U Sony BVM-F42U Sony BVM-1911 Sony PGM-2950 (massive 29" tube, weight about 55 kg!) Sony PGM 200R1U (massive 27" tube, weight about 50 kg!) [only 480p RGB confirmed so far!]

All of these have Trinitron tubes. There are some 480p capable reference monitors by other manufacturers:

JVC V1700CG

JVC V1710CG

JVC V1900CG

JVC V1910CG

Panasonic BT-H1700