Day 1 messing around with GR. Nothing fancy, so please ignore this if the guide or others find more damaging combos.
Standard Day 1 BNB (~620K damage):
(j.:s:), :h:, :h:, :f::d::df::l:, (dash) :h:, :h:, :s:, sj., ( j. ), j.:s:, land, :f::d::df::atk::atk:, :s: followup
Standard Day 1 BNB w/ Dante Jam Session Assist (~670K damage):
(j.:s:), :h:, :h:, :f::d::df::l:, (dash) :h:, :h:, :s:, sj., ( j. ), j.:s:, land, :a1:, :h:, :d::db:, :f::d::df::atk::atk:, :s: followup
A dash is required after Chain of Rebuttal ( :f::d::df::l:) if you are not near a corner. Some characters may be floaty or have very small hitboxes, so the second j. might whiff.
If I don’t want to spend any meter at the end of my combos, I usually call an assist and OTG/meaty a Heartless Spire ( :h:). Not sure if this is the optimal or even correct thing to do, but the recovery on Heartless Spire is very quick and even if they forward roll a meaty one you should be safe.
I haven’t really found an optimal use for X-Factor yet.
Hope this gives people some ideas!