You can add 2C after the 3B in the 66C starter combo for a bit of extra damage.
" 5B > 5C > 3C > j.A (2) > j.B > j.C, 2C > 236A > 236A, 66C > 214B > 4B > 4B, 41236C [100 EXS, 3335 Damage]"
If you get 5B starter, you can go 5B > 3C > Charge 5C > Charge jC > 3B > 2C > 236A > 236A > 66C > 214B > 4B > 4B > 41236C for 3527 damage. Execution barrier is kinda the same.
For corners, you can do Throw > 5C > B+D > 5B > 214B > 4B > 4B. Gives 2034. Adding a 5C after the 5B is possible but it's mean as hell, so just 5B it.