Hmm. If I were you, I wouldn't insulate (just) between joists, insulate below them, or even better just on the floor.
e.g. See photo 5 in here:
BSI-009: New Light In Crawlspaces — Building Science Information
or the alternatives e.g. fig 6, fig 7 discussed in the same article. You'll need to swapout your supporting timber columns tho' (e.g. with AAC blocks?).
Keep your timber warm and keep it happy.
Seen it all go wrong twice with insulation between joists here (UK)... Your local climate will be different of course, but have a good read of that article...
HTH,
Tim.