OK assuming that the rut is now on in my area I'm debating which call will be the most likely to draw in a buck. Should I stick with my grunt tube or switch to a doe bleat call? Or both?

Try one first, if no luck try other. Or rotate calls. Throw in some rattling.

Throw the whole barn at em

"Kill'em and Grill'em"
By The Nug (aka Ted Nugent)

When the rut is on the main thing a buck wants is a willing girl friend, think about when you were a teenager, would you have rather had a fight(grunt call)or a willing young lady(doe bleat)? I use a grunt as a last resort.

The Tazman aka Martin Price
Founder and President of
Virginia Disabled Outdoorsmen Club