@Jozzy, do you still experience the same or has it been better since June?
I just read this topic and feel the same, no problems any longer to sing but a little husky when speaking. I went back to the course to really follow Ken and focus on building even better chest voice to grow the voice more and more to see if that can help me.
Thanks for asking! Definitely it was a problem of technique.
I realised by experience that warm ups were enough to rehearse or even record on studio, which I did a lot in summertime. I tried recording the same song over and over just looking for a specific tone and colour. Sometimes I used natural distorsion, others I tried adding some screams.
Finally I found out that were some specific moments during the song, that I added this "colour" or "tone" by pushing too hard on the throat. I had to understand how to achieve this sound (like a Sammy Hagar or Airbourne distorsion) using hyper glotal compression at times and using some growl techniques with a lot of compression on the diaphragm too and getting a "growl" sound with the mouth instead of the throat.
Summarizing, it's important to sing in the way we do the exercises. If you feel husky or hoarse, start a detalied analysis of your performance and try to find those exact moments that you think are critical or harmful and try to replace it for a safe technique. If you are pushing too hard on your chestvoice without distorsion and you feel a husky or hoarse voice,you should analyse your range and try to use head voice or mixed voice connecting it properly, if not possible, avoid singing that song!. That's what I think is the best way to improve and understand our own skills.
In my case, the proof for all this was that I made a concert with my band (Sixstrings) on september and was able to achieve the tone and distorsion I wanted for 1 hour without any kind of pain or hoarness after the show.
I hope this help! And keep on singing!!