why should limba - ayous - ayous be crispier than limba - limba - ayous ! If you compare these two woods, ayous is the lighter abd softer wood and limba is harder.
Ayous = Janka 430
Limba = Janka 670
Koto = Janka 940
https://stervinou.net/ttbdb/lexik.php
Not sure. But if I take my Primorac Off-, my OSP Virtuoso Off- and Plus and a whole host of other blades I have tried with Limba-Limba, they feel very different from the Limba-Ayous blades I have felt.
It is true, it could be something Stiga is doing when they make the blades. But Ayous feels more springy and when the blade is Limba-Ayous it feels crisper. More snap.
Since I think there are harder and softer versions of Limba it could be that Stiga uses slightly harder versions of Limba in those top plies. I also know they make those top plies in the blades I listed pretty thin. That and gluing process could have something to do with it as well. I just know what I have felt in my hand.
[edit]: an interesting quote from the section on Limba in Magic_M's link:
"although Limba wood is soft, it can’t give a soft feeling to the blade by itself, and when used with other veneers, a Limba blade can give a hard feeling;".
It could be this that I am feeling. I never bothered looking at the Janka rating for Ayous. It is a really good point that it is softer. And I should have looked at the hardness ratings. But it is interesting to me that, all of the Stiga blades I have felt with the Limba-Ayous-Ayous-Ayous-Limba blades have a crisp feeling and feel harder to me than all of the Limba-Limba-Ayous-Limba-Limba blades I have felt. And the Limba-Limba blades seem less springy and feel like they hold the ball on the blade face longer: less bounce even though not necessarily less speed.