op amp for CT sensor
I can offer you some simple changes that should improve things for you.

1) Change R4 &amp; R5 to 100k.  Leave C1 as 1uF.

2) Disconnect the left end of R2 from the junction of R4 &amp; R5 and instead connect the left end of R2 to the positive side of a 10uF capacitor.  The negative side of the capacitor goes to ground.

These changes separate the virtual-earth node (junction of R4, R5, C1) from the feedback network.

I'm also assuming that you are running the op-amp from a single, positive supply with the negative rail pin of the chip grounded.  Please let us know if that is NOT the case - the circuit does change if you are using a bi-polar power supply.