Max and Min RC Oscillator Values and what their practical limiations
The lower Rs2 is the higher the gain, until at some point you saturate the op-amp. This would cause severe distortion. Your V6 battery is backwards. Quality op-amps with JFET or CMOS inputs should have the most range.

Since Rs1 is dynamic, Rs2 sets the overall gain. The lower it is the higher the gain, up to the op-amp limits.