There has been mixed comparisons between the .5 and the .8 amplifiers. Some like one versus the other depending on the speaker and system.
Until last month, when I traded it in for an XP-32, I had a 22 for 18 months. It is a great preamplifier.
I think it would be a significant step up from your X-1. Each successive preamp iteration has gotten quieter and better sounding.
I would reach out to Mark at Reno Hifi. He can send you out a 22 to try at home. If you like it, you keep it. If you don’t, you send it back. An in home demo for minus shipping. Mark is awesome and will steer you in the right direction.
Good luck! Love my Pass!