Low E overpowering

I am playing an Epiphone dot and am trying to play the low E and B power cord for the Blues lessons beginner 12 bar. What I am finding is all I can hear is the low E string when I attempt the power cords either theE B or the E D. I am using a Roland micro amp.
Thanks
Steve

try palm muting.. as you strike the strings..

My guess is pick control.

Both strings need struck with the same amount of pick and force of the pick. It is real easy to strum the E string harder than the others. Watch your pick see how it hits the E string then bounces off it to the A string and bounces off of the A string while never hitting the A string like the E string.

Changing how you hold the pick will help your fingers feel how the pick is hitting the strings. This is one of those things that take hours to get good at.