try and use 3% TFA marshmallow instead of FA's (theirs is more marshmallow flavor rather than feel and it's twice as strong as the other brands) i think the harshness you are getting is from too much FW graham cracker-a little goes a long way. try this:

TPA banana nut bread 2%
TPA peanut butter 0.75%
TPA marshmallow 3%
TPA vanilla swirl 3%
ECX sweetener 0.5% or TPA
FW graham 2%
INW buscuit 0.5%
TPA smooth 1d/8ml

steep 10 days (give the banana tine to die down). it's missing a holiday spice note of some sort possibly gingerbread or FA cardamom, and i also get a bit of TFA caramel original from the actual M&H. anyway try it!!!