If you're using >Edit>Preferences>Units & Rulers >New document Preset.... that will only deal with a document you create when you do >files >New ... you control the output through the >Image Size settings... on one hand, you set the size.. by Pixel per Inch.. at the top... on the other hand, you also set the screen resolution, lower down in the same box... whatever you just "Open", Photoshop detects the size, etc, from what's stored in the file. The top of the >image size dialog SETS the size that will be output, unless you reset it in one of the special case outputs... like in jpg, or tiff. Since you say the problem is in psd files, I'd say that your Image size needs to be tweaked... checked BEFORE you save. Lou.

"..... and that was when things got interestiing."