I am going to go out on a limb & say that 99% of people that make & sell M&P don't add anything to the base to make it more bubbly. I have seen hundreds of people discuss this & I have not heard any real resolution. The chemestry store sells a high quality base from Stephenson out of Canada. It is my very favorite base, I have tried them all *I think*. I have not used the shea but I am sure it's top notch as well. Bubbles realy do not add to the qualty of the soap in my opinion. Glycerin is the most comon additive for more bubbles. There is a liquid SLS that people use to add bubbles to shower gel, bubble bath, etc. I wonder what that would do to M&P? I have never seen that discussed as a possible bubble booster for M&P. You can buy liquid SLS at tayloredconcepts.com maybe you could call them & ask to speak w/ Robert. He should be able to telll you if it can be added to M&P & in what qty.