I've run side-by-side tests trying:

1) rooting gel, powder, neither.

2) anti-wilt and nothing

3) nodes below the medium surface and no nodes below surface.

Conclusions:

1) no gel or powder

2) no anti-wilt-----only humidity dome.

3) nodes below surface ARE NOT required

Most time 100% strike rate ( 7-10) days) with little withering on fans.

Only used rockwool once----hated it. aero clonner, growrocks, or vermichlite works well for me.

Alaric