what kind of lnb's do you have and exactly what type/make of switches are you talking about for the 3x4 and 4x4 because if t hey are dp then you may not be able to add disqec 4x1's because the dp's are disqec switches already

what you really want are dual feed lnb's with zinwell 6x8 switch which will switch 3 sats to 8 receivers..