Re: 93kg or 105kg?
Personally I'd drop to 93k but that's because I'm a competitive twat and would want to place as well as possible. Loosing 4k, which from your info it is rather than 5k and that makes a big difference .
Assuming your diet is pretty 'comfortable' at the moment and your bodyfat levels aren't too low, which from your comments seems fair to, you could easily lose 2k of fat between now and the comp, then the other 2k in water the night before.
I cut weight for my first strongman comp and while I made it difficult for myself I actually enjoyed the whole drama of it all and it made me feel like I was doing something more involved, if that makes sense.
Fully understand if you stick to your guns and the general consent of advice here but just thought I'd add another perspective.
Best of luck either way :)
No biggie like, there are a lot worse things for you than using steroids, I mean I probably shouldn't have been smoking crack or getting into bar fights at your age TBH - drab4