Thanks for the reply, Neil and Ron.
I'm not sure at all if I need to edit either the way my softproof image comes out or how the print comes out. Let me present two examples.
1) Using my APS-generated profile for HP Premium ID Satin, and CS3's View>Proof Colors and View> Gamut Warning on: I print, for example, fromQimage, with the HPPremIDSat profile, BPC selected. In CS3, in the Proof Setup diaglogue I choose Perceptual, and Simulate Paper Color. Qimage lets me softproof again before printing, and uses my image with the adjustment layers, as below.
When Proof Colors and Gamut Warning are selected, my image's color balance shows a slight blue color cast and much less contrast. I duplicate this image, which again looks like my original optimized image. I add a curves adjustment layer until the contrast looks right on the softproofed image, and then use Color Balance to neutralize the color cast, most visible in the pure whites and high tones. When I print, the printer output matches my softproofed image with the two adjustment layers well enough to satisfy me.
Does this mean I don't need to edit anything? Or does it mean that I should edit "In the Softproof Direction" to make my Proof Colors image look like the print without always having to add the adjustment layers?
2) The second example: My APS-generated profile HP Hahnemuhle Textured Fine Art Paper appears to have a smaller gamut and muddier low tones than HP's generic profile for that paper. Also, dark reds are much worse in the APS-generated profile than on HP's generic profile. Would editing the APS profile from the Printer direction give me the possibility of correcting the problems? In fact, would benerating a new APS profile give any chance of making a better profile?
Sorry for getting so wordy. Maybe I need to softproof my posts