Update on my "research"
I have been going over the wiki and alot of other stuff ive searched from google on these things (op-amps)
I seem to have two options
either i need a differential amplifier, so that i can take the two positive outputs from the shunt (one being the "un-altered" voltage and the other being 0-50(or 100)mV less) and get an output voltage from the op-amp which is a function of the difference of the two different voltages...which...hopefully i can get to be 0-5v (doesnt look like this is possible) if i can not do this, i would need to add another op-amp after the differential amp in series into the FB input
Use two separate op-amps one having the input voltage being the "un-altered voltage" from the shunt, the other op-amp having the input voltage as the "altered voltage" and having the fusion brain see the two voltages from the op-amps outputs and doing the math via software.
I am not quite sure if i would need to use inverting or non-inverting OP-AMPs (trying to do the math with the resistance values to see which will suit my needs)
so i drew a diagram for both
Dual Non-Inverting Op-Amps
Dual Inverting Op-Amps
Using the second option would obviously take up four of the analogue inputs into the FB, which is fine, i only need two more for the temp sensors, and one for the voltage sensor
so 7 ports will be used, three left for future sensors