Mod prep for any event

So I tried to complete the first portion of jedi knight Luke with wampa. I met the requirements and figured this wouldn't be too bad. After numerous attempts of getting badly beaten I took wampa to relic 7 and sliced some of its mods and still no progress and jkl isn't even a galactic legend. Similar issues with toons just underperforming in other events despite overpowering them hoping to make some progress. I get that swapping mod sets is my biggest setback because I hate mods with a burning passion but seriously how should I go about picking the best suited mods for a particular event? I'm tired of blowing resources on overdevelopeing toons just to still get destroyed everytime