Yes, remember when you see 24.233 inches, that .233 inches is overspray so if you "bump" the prints all the way to the edge as Fred instructed, about .12 inches of the print is going to print off the page: you can see in the page editor that their location is "0.00" inches from the sides which is beyond the edge of the physical paper (by about .12 inches).

If it is paramount that you have exactly 11 inch wide prints, there are two simple ways to deal with this.  If the prints are 1/8 inch shy of 11 inches, just add that back: specify a size of 11.125 x 153 instead of 11 x 153 and then do exactly as Fred instructed. Don't know why you'd resample in PhotoShop when it won't do as good a job at resampling: just specify 11.125 x 153 in QU and print using Fred's instructions about bumping using the Ctrl-arrow method.  The other way to do it is to experiment with distances on the left/right.  Instead of bumping both sides to 0.00, you could try 0.1 (just enter the numbers in the location boxes in the page editor).

The down side to the second method of trying to perfectly dial in the edge is that after printing a print that is more than 12 feet in length, if you think that paper isn't going to shift left or right by a millimeter or more and by the time you get to the end you'll see a small white sliver, you're in for a rude awakening.  You are going to run into this problem in any software and on any printer when trying to get exact alignment printing borderless.  In fact, no matter how you do it, if you are printing a 12 foot long print, I wouldn't be surprised if your print itself ends up being exactly 11 inches when you start yet one of them grows by 1 or 2 mm and the other one shrinks by the same amount by the time you get to the trailing edge of that print.  You are asking the printer to do the impossible: to be accurate down to almost the atom in feeding that paper.  The only way to really ensure exactly 11 inches is to not print all the way against the edge (don't do borderless).

I think the closest you are going to get (without trimming) is to just specify 11.125 x 153 inch prints and then do exactly as Fred instructed.  If that ends up off by a fraction of a millimeter (possibly only on one print), you'll have to modify the numbers so they match the "slop" in your particular printer.  No two 9890's are going to load prints at exactly the same locations WRT roll and even how the roll is first loaded, type of paper, and humidity will affect things.  I've even seen two rolls of the exact same paper shift left/right by 2-3 mm just based on how it is loaded on the cardboard tube inside and it even feeds slightly differently at the end than it does at the beginning of the roll.  These are all factors you'll have to deal with if you are trying to print borderless and get exact sizes right up against the edge of the paper.

If you've already done (at least a few inches of) a test print, you have all the data you need.  Let's say you did as Fred instructed and the print down the left side of the page was 1/8" shy of 11 inches and the one on the right was 1/16" shy of 11 inches (they may or may not be the same).  Then just add those back: make the left print 11.125 x 153 and the one on the right 11.063 x 153.  Then repeat Fred's instructions above and you'll get as close as you can possibly get.

BTW a fair amount of this "borderless conundrum" is covered in the second learning video on this page:

http://www.ddisoftware.com/qimage-u/learn.htm

Mike