realskiers

Mike, my thinking is that it is far easier to soften a stiff boot, than to stiffen a soft boot.  I went through this with my Inferno 110's, which I found just did not have the beef to hold myself (at 6'2", 220 lbs) and a pair of stout Dynastars on steep slopes and in heavy crud.  I was just overpowering the boots.  Adding industrial grade, triple-ply Booster straps seems to have solved that, but Boosters aren't for everyone, and I recall you mentioning you weren't a fan of them. 

In any case, I was peeved, as I had only had the boots for one season, and it seemed I had already outgrown them.  I regretted not buying a 130 right from the start, and softening it to suit temporarily.  I may still switch, if I find the Boosters are not the final solution for me (too early to tell).

Eg. Gary skis a Lange RX130, and you know he's no Thor.  But he has significantly softened that boot to work for him, and he can still reverse some of the tweaks if needed.  Ask him for details on what he did -- definitely the spine bolts are out; but whether he cut some of the inner shell I'm not sure.

If the shell of the Redster 110 is a perfect fit with minimal work required, then how about buying a 130 online and paying a bootfitter for a few tweaks? Or see what's on offer at Ellicottville at the end of the month.  There is at least one really good store there -- ask G for the name.

The Redster is certainly an interesting boot design.  The shell is shaped so that the foot sits flatter on the bottom (flatter lower shell profile), supposedly giving better edge control.  And the cuff can be rotated on the vertical axis to allow the knees to track straight.  Kind of like traditional cuff alignment, but in the other plane.  Cool.... 

Hope this helps.

PS:  there is a big difference between one brand's flex indices's and another, and even within the same brand (Dan may disagree with me here).  Through some boot testing in the spring, I found several at 130 flex that were significantly softer than my Infernos at 110, including another Tecnica (go figure).  Other 130's felt about the same, and only one or two were actually noticeably stiffer.  Turns out my 110s are pretty solid after all, which was reassuring.  Not sure what the Redster feels like, but if it's solid in the shop, then it will be more so out in the cold.  Bottom line - I wouldn't pay too much attention to the numbers, but go by feel instead.