I never knew fills got scientific!
Limited ang vocabulary ko sa filling so...
All I know is, fills fill, as in nagtatakip ng butas. Kung may butas, pwedeng i-fill. Pag may laman na, you might overspill, which is good if you intend to saturate that particular part.
Slower off beat (but meets the metro eventually) e.g. 3s or 5s on 4/4 if I want to attract attention to the bagsak right after, as a transition.
Rigid to the count (e.g. quarters on 4/4) if I want to just continue the previous feel without attracting much attention. Or, if I want to accentuate or re-establish the current feel. Faster if I want to cue a different section but still retaining the feel.
Fills that continue till the bagsak are meant to maintain he momentum or gradually slide it up or down. Fills that leave a space before the bagsak are meant to accentuate the bagsak.
Dynamics would depend on whether I want to build up, tear down, or maintain the intensity of the overall poste.
Yun na lang muna. Practice muna ako. Hehehe.