250mg a week is about a TRT dose. It might still help with gains. It's not like as soon as testosterone is added to your system nattural production shuts down. TRT gels boost levels. However, I don't see any reason to use 250 instead of 500.
Also, what's up with this hcgenerate stuff. It seems like lots of people are including it in PCT now - specifically hcgenerate, not just hcgenerate or other similar supplements.