the amount of FX in a serial loop is really a personal taste subject. Reverb may require very different settings from delays..and modulation fx are another different planet. There is no ideal setting really. It's a matter of personal tweaking for your own taste and needs. I generally do not use a 50/50 setting, enjoying more a 60/40wet one.
Comb and Band delays are subtle fxx. They can be made more prominent depending on what you play 8tonal content of the instrument) and correct setting of the filters (band) or resonance (combs). They often do not sound gret right away as are very sonic_content dependent.
In addition to all of this, FX loops can be designed in very different ways, from very poor to very good…and anything in between.
all the best