No, they are useless for anything except 72.5 and 95W
I have lost track of exactly what is your current configuration but I remember posting that you would have problems combining the signals from multiple LNBs because the LNBs are not "pure", i.e. if you use a Multisat LNB pointed at 99, it will still receive 101/103 signals and if you combine those with signals from another multisat LNB pointed at say 101, the signals will be out of phase and will cancel each other out. This is I believe why your "combiners" are causing you to lose signal strength.
This is a well-known issue for people trying to combine the outputs from two off-air antennas.