Hmm, yea, though salvage is actually pretty nice to the player, in terms of net change. I mean, don't do any merc fleet wipes if you value your life, but even playing very casualty-heavy (to me, younglings are projectiles, and planets are targets) the reprisals weren't doing much to me on 8.6 recently.
Anyway, whatever you prefer, of course. But split-difficulty between two adjacent steps is probably not necessary during the ramp-up.