My past experience with Chinese silicone o-rings lies with the red ones, they just didn't seem to hold up for long.I actually have these O-rings in front of me- all 50 of them. I can attest they are not "overly soft". In fact they feel and look to be exactly the same material as what comes on the Tobeco KFv4 clone from the factory. If I sent two of them to someone and didn't specify which was which, there'd be exactly a 50-50 chance of discerning one from the other.
But if there is anything to take away from this is- again- many people are using the FT O-rings w/o issue. So sometimes a cigar IS just that.