Sorry to hear about your issues with the MSL. It seems that the MSLs were once the flavor of the day MC.
I can certainly attest to the sonic merits of the Soundsmith Hyperion. It is easy to set up (mounted on SME V), has a recommended minimum loading of 470 ohms, and tracks without any hiccups. These are traits one would want of any cartridge, especially ones reaching higher into the stratosphere price-wise. I have yet to setup the Airtight Opus 1 on the Transrotor TRA-9 Gold arm.
The system is mostly assembled after nearly a year in storage due to our move into our new home. I posted a while back that I would conduct a comparative analysis between the Hyperion and the Opus 1.
I only had about a few months of play time with the Air Tight before I started packing things up. However, I distinctly recall that the Hyperion hits way above its pay band compared to other uber price MCs. It just does what we want, plays musical in the most beautiful and articulate means possible. The noise floor seems as if it is also quieter with the Hyperion. The Air Tight which costs a lot more, seemed to need lots of special attention to dial in.
I suppose at that level, one would expect some extra detailed measurements. It is finicky to setup. Whereas, the Hyperion was a simple install. I used the Wally tools glass protractor to assist in setup.
I truly believe people should look at the Hyperion as it is probably a sleeper giant killer compared to others above its pay band. Good luck.
PS. Now I am going to look in my library to find some Lawrence Welk. Have not listened in years:)