Expressions/Events For Radial Recoil

I've implemented a radial aiming system for the platform behaviour with some weapon recoil using the method outlined in dop2000's excellent tutorial (thank you!). I've adapted this to a gamepad, and it's working well using the following events: -

However, I'd like to add some radial recoil to complement this, and I think I can use the same method, but I'm struggling with how to adapt the expressions to fit this radial movement instead of the single opposite angle that the gun is firing. Could anyone suggest how I might do this?

The end result would be something like this (i've roughly simulated the movement manually to show this - the quality of the gif makes it a little hard to see, but the gun kicks both backwards and radially around the aiming arc of the player, and then resets to default position): -

The gun can rotate to any angle - it’s pretty much the same as your example, but mapped to an analogue stick, so it would recoil based on its relative position. Here’s another quick gif showing the current implementation: -

I've implemented my own version adapted from the mouse control, but I'm running into some strange behaviour which might be related to gamepad controls and lack of a mouse cursor to reorient the radial position to. The radial motion is funtionally working, but I'm not exactly sure what is causing the issue (it's possible the analogue position resetting to 0 if the player shoots and lets off the stick?).

I've attached the project file if anyone with a gamepad could have a look - you should be able to see what the problem is compared to the effect that I'm trying to create in the first animated gif. Essentially, the example that dop2000 provided is exactly what I'm going for, but mapped to gamepad.

https://www.dropbox.com/s/4rqw7ulf78hle2g/RecoilGamepad.c3p?dl=0

This is a quick gif of the issue that might be helpful too: -

Thank you for any help you can give!