While I appreciate the upload of this profile, I agree with warflame. We should be able to access exact copies of the built in conversion settings for experimental tweaking. This is simply because we have used the Easy Mode profiles and thus have a point of reference.
For example, how does your PSP 4-3.xml file compare with the 5 profiles that exist for the PSP?
I have personally preferred the "XviD for PSP 16:9" profile, but would like to tweak it to use 420 x 270 dimensions, but I can't for the life of me replicate the initial settings. Somewhere, I am setting something wrong and getting files that are 10x larger than the source video!