Jamie,
Congratulations on your acquisition. I have the same rifle, and it is by no means a safe queen. It's a shooter. If it were unfired and in the box I would perhaps keep it that way, (and find another to shoot). It has become one of my favorite little rifles, and has rolled a lot of jackrabbits. It sees more action than the half-dozen other #1s in the safe. I did quite a bit of load development years ago, with a good scope on it. Right now it wears an NECG peep sight. I had an extra stock that had been shortened by about an inch, and it went on the .357. It is surprising how that improved the handling.
Regarding loading for it, I had a similar experience. It's a bit finicky. I found no advantage with the various forend fixes. I noticed that the groups got smaller with the heavier bullets. I settled on the Hornady 180gr XTP and the 180gr SSP. Both bullets found a sweet spot and the groups settled down when driven hot with H110. It shot 1-MOA average groups at 100 yards off the bench, and was quite consistent in its preference. Don't expect the SSPs to expand upon impact. My testing only resulted in expansion about 50% of the time. The XTPs, driven at rifle velocities, are devastating on varmints. For me, the primary advantage of the SSP is to distinguish my hot rifle loads from my revolver loads. Don't want to mix those up.
I have no advice...this is just my experience. The chase is half the fun.
Regards,
Schuter