Figure shows the PLTF of IMC loop with SR560 + 150k notch + 50ohm resistance.
Thin line shows the OLTF with the nominal IMC gain determined by the IMC guardian.
Thick line shows the OLTF with increasing gain by 3dB from thin line.

A peak at 150kHz was disappeared thanks to the notch filter and we can increase the UGF at 130kHz without any problems.