Store formulas in variables. Use replace keyword to replace the formula in the front end.
Using expression/measures is good but they are inflexible. They can't be clubbed together and used with anything else.
So if you have formulas, put them in the variables and store them in a Excel sheet. Pull them together in the load.
Qliksense will automatically index them and you will have very flexible variables which can be used, literally everywhere.
Thanks and regards,