I would suggest that, Yes, it's worth waiting for 300 hrs break-in -- just to be on the safe side.
While the Shanling did seem to be the ultimate in detail extraction (pleasant, articulate, and "musical" though!),
I suggest you also TRY (i.e. borrow -- do NOT buy) another pre and another pair of speakers. There are many british speakers with good tonal balance and upper extension (that helps bring out the detail you seek) -- if that's what you're looking for. ATC is one of the best in this respect. They also manufacture drive units; their upper mid driver is one of the best in the market (and you get it on their speakers).
Cheers
While the Shanling did seem to be the ultimate in detail extraction (pleasant, articulate, and "musical" though!),
I suggest you also TRY (i.e. borrow -- do NOT buy) another pre and another pair of speakers. There are many british speakers with good tonal balance and upper extension (that helps bring out the detail you seek) -- if that's what you're looking for. ATC is one of the best in this respect. They also manufacture drive units; their upper mid driver is one of the best in the market (and you get it on their speakers).
Cheers