Hornady does trim some brass for their FTX loads, but it appears 35 Remington is not one of them.
Given that the shortened case does not require bullets to be seated deeper, the standard data can still be used. The internal volume is not changing, hence pressures will remain the same.
The only question about these cases was potential accuracy issues with such a short neck. Fortunately, just as the 357 B&D and 358GNR have short necks, and still shoot quite well, the 35 Remington-Short (+P or otherwise) has proven to be plenty accurate. Keep in mind that this cartridge is still going to be limited to around 200 yards, so even if you're only getting 2" groups at 100 yards, that is still perfectly sufficient for hunting deer.