Honestly you should do muting or even glyphing instead of suffusencing if you are making it for fg purposes.
You get essences when you mute items.
You can use those essences to either mute something new, or suffuse some item (glyph, fish, comfrey), which will add either duration of time (glyphs) or healing / mana recovery power (fish, comfrey).
When suffusencing, wait until word pops out, do not click anything if there isnt word.
When word pops up, click corresponding button, once.
Then wait until next word pops up.
Repeat that progress until you have either completed item, or you are about to lose it, in that case just abort it, so you get some prof points atleast.