I've no direct experience of making a bush , a machinest did the job on mine, but it seems to me it would be best to leave more than 001 under size to allow for line boring? As I understand it one of the reasons for line boring is to cater for cases not having the 2 main bearings axially aligned and 001 would not allow much metal to be removed during line boring, should the cases be more than a few 000 out.
I think you can also take getting it to the next level, as my machinest did, by line boring parallel to the bottom cylinder face as well, but the more "blue printing" one does...... the more $$$$$$ I guess!
My machinest also (line) bored out the plain bush housing in the crank case as it was worn oval, he reckons they nearly all are nowadays, this means of course a standard bush cannot be used and a one off has to be made anyway, he makes them in steel with a suitable bronze liner to keep the cost down at the next rebuild by just replacing the liner (not that he sees many of those he says as if you get the job done right it will outlast the owner!) it also enabled him to get the mains almost perfectly aligned in all directions leaving little left for the line boring to do in the way of achieving perfect alignment. He has a ready made jig for doing the line boring so it's no extra work for him to use it anyway.
As your bush I.d. did not shrink much when fitted I suspect the housing was not round, which I realise is not what you wanted to hear (sorry) but I applaud
you having a go at this job and if I had the equipment (eg a mill and jigs) and skills I would also give it a go
I realise these are just opinions and there are many on this topic and what's best in each case depends on the state of the components ....my cases were not a matched pair so I opted to have the "full monte" job done and I'm lucky as the local machinest guy we all use is incredibly cheap whilst also experienced in this sort of work, particularly on a10's.