When using gel, I only use the 1:0.8 (Maurten, SIS Beta Fuel) When mixing Malto / Fructose, I use 1:1. Moving the ratio towards even does allow you to take in more carbs, because you’re holding Glucose steady (or lowering it) while increasing fructose and overall carbs.
Lots of threads on this general topic here. Good starting point here:
https://www.trainerroad.com/forum/t/how-are-people-getting-100g-carbs-in-a-bottle