@MoverZ: Practically speaking,zero loads at mating flanges are not possible for sustained condition because changing spring parameters to bring loads close to zero plays bad with Flange Alignment or with thermal loads.

I've seen compressor vendors who were adamant on zero loads or zero displacement at mating flanges. It was really tough for us to make them understand that this was not possible.

As far as alignment is considered, fit-up spools are the best option to reach a perfect alignment.