not much to add but if you are keeping the Roadmaster perhaps consider changing your tires to something with less rolling resistance. Needing to inflate your tires after 2 or 3 rides is normal.
Saddle, grips, gloves may help but some of that could also be the position you are in on the bike. I concur to keep reading on TE about saddles, etc
You can certainly do some tweaking yourself - ie saddle height, angle, forward or aft (if the rails allow).
Not sure how much wiggle room you have for raising or lowering the handlebars, you may need to raise the bars to see if that helps with the pressure on the hands.