Have you tried the JustJam on Toast? I am pretty sure they use INW Strawberry shisha with another strawberry. Maybee Breakfast + INW strawberry shisha is what your looking for? I order Breakfast and will get it next week so I will try yours and my own take on it.
Havent tried any jam on toast juices at all. Have to say Im not a huge fan of shisha strawberry though, liked it at first but do get a bit of a weird metallic taste really lightly to it. Can see why it would be used in a jam though. Hope you like the solub arome concentrate, I think its the best of its type, that I have tried anyway