Front Derailleur Tuning Question
The spring tension of front derailleurs is not normally configurable.

Addressing your difficulty shifting up, have you checked whether the High limit screw is preventing the mech from moving all the way, forcing you to stretch the cable until the shifter reaches the ratchet point?

The shifter is normally able to freely pull cable slightly beyond the ratchet point to allow you to ensure a successful shift, releasing the tension until the ratchet point so that the cage does not foul the chain running on the selected chainring.