I've had this problem throughout my life. Especially after long batting cage sessions. My solutions have been Easton Adult HS VRS Batting Gloves that have a pad right there on the outside of the palm (I assume specifically for this issue). I haven't had the blister since I've worn those, but the Easton model is discontinued you can try searching Amazon for whatever places have in stock. Also the last year I have had one of those rubber Bat Ring/Power Pads on the knob of my BP bat and it seems to have cushioned the knob enough to stop the problem as well.
EDIT: Here's a Rawlings glove with the same type of palm/heel padding
They are vital to do the program correctly. I just bought two baseball bat weights like these, they fit perfectly.
I use a "bat weight" such as this: http://www.amazon.com/DeMarini-Bat-Weight-Red-16-Ounce/dp/B005EZ3ABW/ref=sr_1_2?s=sporting-goods&ie=UTF8&qid=1463515414&sr=1-2&keywords=BAT+WEIGHT
I attached two rare-earth magnets with electrical tape, and voila! You simply slide it up and down the bottom of the tube to adjust balance.
There are cheap alternatives to micro plates. I bought a couple 20 ounce bat weights on sale and they fit the bar perfectly. Others use weighted wristbands, lengths of chain, or they'll put a 2.5 lb plate on one side of the bar and swear they don't notice the imbalance.
I bought a couple of these:
http://www.amazon.com/dp/B0018BEGQE/ref=cm_sw_r_tw_dp_Pwtmwb02A3TN7
They're stated to be 1.25 pounds. I weighed them and they're close enough. Also, they fit snugly on an olympic barbell, so no worries of it falling off. A bit expensive, but easy to buy and use.