The new salmon 6" Grubs that have been so good to me this season are very, very soft. The worst I've seen yet. Earlier in the season the ling and biscuits were tearing them apart before a decent fluke could get a good look at them. With both of those species now finally backed off, its not quite the problem that it was.
Last Sunday I did fish a Salmon grub back-to-back with an older-version Fire Tiger from about 4 seasons ago. While the older grub was very much tougher, it had nowhere near the beautiful swimming action that the new Salmon one did. Maybe not so coincidentally it also caught far less fish. So maybe there's a lesson in there somewhere.