Not a conflict per se, but you might want to move SCSII further down, simply because the reinstall can take (up to ten) minutes if you later decide to change any options. And you will, it takes a bit of experimentation to find the balance you like best. (I have SCSII second to last, but I'm not familiar with aTweaks or Dungeon-be-Gone - check their readme for compatibilities)
I would also add
<span class="bold">TobEX</span>, because I think SCSII will install it anyway, but you want the newest version. It has some handy options you cannot get anywhere else, though some might be considered cheats or rule changes, so use your discretion. And TobEX should be installed in the very first position, before BG2 Fixpack. (Although this is an "in progress" mod that changes the EXE, it seems pretty stable, I've been using it without issue since day one)