sometimes you are constrained by the plant, i.e. some naturally have good spacing between flowers, others will always be crowded no matter what you do.
I used to grow a bunch of phals and this is what I would do--when the spike starts to elongate past a few inches, I would keep it loosely staked so that it goes vertical...but only staking it to about half the height of the spike (which you have to estimate). the upper half goes unstaked and hopefully the spike will arch over nicely.
this is best done, I think, with a fixed direction light source like a window. it also varies according to the type of phal--the standard ones with 6-12 nice large blooms tend to present well. some of the newer ones with shorter spikes and fewer blooms per spike may not present "classically" and are semi-erect.