Sip growing and peat free ?

[Bio boy]

I’ve a compost that’s awesome and wondered if I can do sip with it
the guy who made it said it’s bark fines and wool bracken so worries it will wick too much water ?
earth box says should be 70-95 % peat based , I know others have done different soil blends n shot so what’s the science ? What’s the score ?

 

[Creeperpark]

70-95% peat base substrate is the common ratio. With 30% to 15% amendments depending on organic or synthetic preference.