TLV3601: Long delay when used as current zero crossing detector with a shunt resistor

Tool/software:

Hi,

I am trying to design a current zero crossing detector with TLV3601 based on the following circuit:

However, I found that there is a long delay (~150 nS) between actual current zero crossing and TLV3601 output change, much longer that datasheet specifications.

What can I do to minimize this delay?I need the delay to be <40 nS, preferably <10 nS. I have tried using smaller RC values for the LFP before TLV3601, but it did not help

I noticed that the delay specified in comparator datasheets are usually based on an overdrive voltage of 50 or 100mV, while I may want my comparator to respond at <1 mV input voltage difference. Is this the reason why I am getting much longer than datasheet specified delay?

Is there any comparator that can meet my delay and input voltage requirements? Or will it help if I add a preamplifier stage, similar to the following schematic from TLV3511 datasheet? If yes, which amplifier should I choose? The TLV3511 datasheet does not seems to provide any recommendations for the INA.

Thank you