Message to User:
Be careful about abbreviating the word "you".
I think wasting pre is not worth it to use on opener.
If u are lucky enough with Pre + CS u will actually lose some energy if u get lucky on energy proc since you will have to use finisher instead of hemo straight away. Also i did like the fact that if i use finisher after Pre+Cs i cant do hemo twice during cheapshot doing pretty much nothing to my target, doing less pressure at the start.
I like to keep pre for those moments when i have to keep something in place during the fight with vanish + pre + cs followed by kidney where during CS i just do nothing regaining energy that i will blow during KS and after KS for kicks/gouge, works very nicely if u want to finish a single healer teams in 2s/3s.