Help getting the best video quality for Original Xbox on CRT TV

Hey guys! I recently got a CRT TV and have been playing my Xbox on it! I noticed when playing some games it seems very blurry, and I had this same problem on other TVs so I took to searching online for solutions.

I am currently using the RCA cables that came with the original xbox and have them plugged right into the TV, but when reading online I saw people highly recommend getting S-video for a big quality boost. Upon digging more I came across some talk about the Xbox HD AV Pack and saw some had only RCA ports and some had S-video as well.

So my question is, what can I do to get the best video quality?
Is it using a dedicated S-video cable straight from my Xbox to the TV
Using the HD AV Pack with RCA cables
or using the HD AV Pack with an S-video cable from the pack to the TV?

Thank you guys!!