I am now on my second used RBX170, the first one left me but I scored another for $75. I have determined it is strung with 45-100 Boomers. This is my first experience with Boomers but I'd like some input regarding the E string. I am finding the 100 is not as tight as I'd like, I was used to 105s (Yamaha stock then Slinkys) on the first one I had, but I do like the softer flexibility of the lighter Boomer E string. Is this flexibility because it is a lighter string or is it a property the Boomers all share? I am going to change these strings out for a set with a thicker E most likely, will a 45-105 set of Boomers feel tighter on the E and still have the suppleness or is there another string I should look into? I would usually look at nickel roundwounds (plated or pure). Are tension and flexibilty mutually exclusive?