Having to Use Up My Supply of "Normal" Strings?

 I've been going back to my string reserves, which is to say D'Addario EXLs that I bought a large quantity of on sale at a "crazy" price. 

 While I've decided that Ernie Ball Paradigms are the way to go, I'm not throwing away perfectly good strings.  So I've used the D'Addarios for the past few weeks.

 I miss the Paradigms.  Here's what's different (from the reverse perspective):

1) I'm back to having to fiddle with the tuning a lot.

2) they get duller and duller immediately.

3) the intonation crosses the "can't play in tune" threshold within days.

 This isn't something new, I've dealt with this most of my life.  What is new is having forgotten about the above having used the Paradigms for awhile. 

 The Paradigms aren't perfect.  They're a bit stiffer (almost thought "gee, maybe they're labeling a set of .010s as .009s?), and pricey.  But they sound pretty much the same for the life of the string until the very end, as does the intonation.  Then both suddenly go bad.  So suddenly it's startling, within a few hours they will either stop playing in tune, not stay in tune, or snap.  It's really quite strange.  I've been in the middle of a lesson and I have to pick up my spare guitar, because my main guitar won't hold tune for more than a minute.  Very strange.

 Not as strange as not understanding the metallurgy that makes such a startling difference.  It's not like they're carbon nano-tubes or quantum Boson matrix strands, it's got to be a metallurgy process but it seems unreasonable to think it would make such a big difference.  I'm aware of alloys that can be startlingly different based on adding just a 1% difference, but in such a daily, practical demonstration it still seems almost impossible.  I'm not an endorser, I don't get a price break on them - I pay what the reader pays.  But it's a great thing that in the 21st century there are strings that stay intonated much longer than "normal" strings.  It's the way it should be! 

 But I've got a few boxes left of the D'Addarios.  Which are aggravating, I can even see on the tuner they're not as pitch stable almost immediately, and having to change them so often is a big drag.  I'm not disparaging the D'Addarios; I've used all the string brands and use the EXls for the sole reason they were the most consistently reliable.  They haven't changed, but they're not as good as the Ernie Ball Paradigms. 

Maybe EB will drop the price on the Paradigms in the meantime.  Or D'Addario will answer by making their "normal" Xl strings last nearly as long without the high price?