THS4541 question about Simulation

Hey everyone,

right now I would like to amplify a Signal from my Resistant Strain Gauge...

I apply 2.5V to the Bridge and the Gain from the gages is 2mV/V.

I measured the Values from the Ouput and Simulated the Bridge(See attachment).

The Settings for the MFB:

Feedback Filter

Vin(s)→ →Vout(s) R1 = 240Ω R2 = 1.3kΩ R3 = 43kΩ C1 = 68uF C2 = 0.1uF Cut-off frequency     fc = 8.16318748938[Hz] Gain at f=0Hz     Gpk = -179.166666667[times] (45.0651442774)[dB]

These are the Values for the 0kg input....

for 1kg, the Resistor Values are:

R8:   293,35

R9:   294,05

R10: 293,22

R11: 293,74

I am not satisfied with the results maybe I misunderstood something or the Offset is too high or something else...

I get about 105µV on VM2(Input) and  about -41mV as Output(VM1) this is a Amplification of -390!!

when I change the resistance according to 1kg... the input becomes 342µV and the output 1.3mV thats about 4...

My question is now is the amplification too high? or what is my problem in general?

Best regards

Bastian(Please visit the site to view this file)