Thanks, Phil. Great to have some recommendations to try. I do have my eye on the Saucony's, but that may just be because I like the name! I don't think Sweatshop stock them, which is a shame, as it would be good to try them out under the 14-day return policy (if they are still doing that).
As a wearer of the Tempo, I'm a bit confused about the latest incarnation which looks heavier and, as you say, seems to have changed the stability it offers. Any suggestions for an alternative lightweight shoe of a similar type? I'd wear them for faster training and races up to half marathons.
I'm not sure it's a good idea for all your gels to be caffeinated. I thought those were to be used sparingly, at an appropriate time in the race, in conjunction with normal gels. I also would not have sports drink on top of gels. Water seems a better idea. But I do appreciate that everyone is different.