Kasumi GotoEnhanced low power is an engineering effect so you can use it on the biweaves if you want. Their weight is the same as an A-rated shield generator anyway (which really makes it no decision imo, just take the stronger shield unless worried about its power draw).
I'm comparing them on my MD now. I see what you mean about the weight. So, you'd suggest the 4A over the 4C Biweaves?
If so, I think you might be right. Maybe the 4A with Enh Low and Hi-Cap. Seems like I'd want stronger shields over regen anyhow, for this current build. I could do the bi-weaves and do Reinf, if I wanted the regen.
I do need to watch out for power draw, if I intend to ever enjoy the weapons I have on it. Trying not to eng my Power Plant past grade 3 for the sake of heat, but I definitely could.