I know that tune!
your guitar sound is doing pretty good.
I'm not knocking your singing at all, but have you ever taken these pop tunes and dropped the melody down into your natural voice range?
I think you would have a powerful voice, and it would sound good, plus it would get you out of the very top reaches of your voice where you are straining. It would fit your guitar sound well, too.
just a thought, brother, I like what you do, so do what you do, but maybe its just something you can fool around with a little and see if it works.
a lot of these rock singers were actually little guys, natural tenors really, and so when a big cat who is a natural baritone has to sing a tenor part, you can do it, but you really have to strain
but if you move the melody down into your natural range, you can belt it out
belt it out while you are blasting away on the guitar, too
....just a thought