Raising the ambient light to bleach out those shadows off the wall make stuff crazy flat. Bounce them or diffuse them and create a larger key source. Good luck!
Dedos are amazing, they're my No.3 must-have light behind a 1.2k HMI PAR and decent softlight like a 401 Kino. If they're all you have, then you're going to have to get your softlight through either diffusion sheets or bouncing. The good news is, the amazing precision of Dedolights makes directing and controlling your bounced light easy. Rig up your bounce card out of frame on a c-stand or magic arm, then fire your Dedo at it from wherever.
You can dim, cut, shape and control Dedo's so easily, that I don't think you need to worry, just get creative.
However the big bit of advice I'd offer is this: If you only have three 150w lights to light your whole web series (which is a hugely ambitious thing to do lighting wise!) then you need to have multiple practical lamps that you can place throughout all of your scenes to motivate the light you get from your Dedos.
You won't get a lot of light from three Dedos, so you can't light up your whole set with them. But you can get away with that if you have practical light sources in the frame (or established in your masters) that provide 'motivation'/a reason for existence, for the small splashes of light that your Dedos fire into the scenes to light up talent.