I can't be bothered to check, but usually, those things are calculated separately from the "normal" burst modifier. Usually your burst modifier is rarity bonus (200% Rs to 500% on Awakened SSRs) + burst damage buff (capped at 300%/500%, this includes PF, Exceed and other +burst damage skills like Asherah's stacking buff).

But for some Hime, it's rarity bonus + bust damage buff + special modifier. Like that Countdown 0 buff that one Awakened Light Hime gets, her modifier isn't added to burst damage buff if I recall right.