Pokes into HP tk feint

I’m new to viper but I can do the fff really easy, due to the negative edge trick. I want to be able to do like cr.lks into hp tk feints or just the rest of her normals other then heavy into hp tk fients. I think it would help to get my pressure up with viper i just want to know, is there any tricks that can be used to do this?

I personally don’t negative edge. I know that the feint timing for close fierce, standing fierce, and low forward are similar. The rest of the cancels are pretty close to the raw hp tk feint. Just like everything else with Mya grind it out until you find consistency.