A drop away rest is more forgiving. I think you would be glad you got rid of the Whisker Biscuit. As far as adding a stabilizer, there is really now way of knowing until you try one. A good pro shop will let you try several different models to see which one if any helps you. Parallel limb bows and past parallel like the Bow Madness shouldn't need much if any stabilizer.
Shooting properly spined arrows with correct FWC for your broadheads is required for best accuracy.
Be sure you are using good form, that your draw length is correct, that your peep sight is set to the right position so that your sight pin is centered in your peep and that you get a clean release with complete follow through for each shot. Paper tune your bow so that you know you are getting good arrow flight.
Although short axle to axle bows like the Bow Madness are popular for tree stand hunting, they are not as forgiving as a longer bow.