Manage Impossible Variable Fillet

[francesco.bacchini]

Hi everyone, sorry to bother you again with another (stupid) question about filleting two surfaces, but I'm almost going crazy trying to apply a variable fillet:

Toggle ModelVariable Fillet

Somehow, my fillet is unable to reach the tail of the model. I've tried with several numbers, but nothing changed.

Here's also the original file.

[Anonymous]

Hi Francesco,

I think you need to slow down a bit and learn how to analyze and improve your geometry before you move forward.

I regret that I can't explain every step of my modeling workflow for this particular part. However, you can watch my videos at my YT channel. www.themodeldesign.net

Good luck

[francesco.bacchini]

@Anonymous , thank you very much for the suggestions. 
Luckily I already managed to solve the issues of this part.