I have the 7-1/2 SRH and do find it to be a great shooter. The only thing that I did to it was a trigger job.
The original spring was poor, after a Wolff spring kit it was light but had a little creep, I took it apart and lightly honed the sear and connecting parts. It was better but not great, after a year and perhaps 1,000 round it is now very good.
Other than the trigger I have done nothing else. I have toyed with the idea of sand blasting the hell out of it to make it a dull finish.
Perhaps you could buy the 7-1/2 inch barrell instead of chopping and crowning your old barrel and then remounting the sight.
Good luck,
Fred