As my main HT has gone off for a respray, I'm currently running 140mm forks on a 100mm corrected frame.
Despite looking a bit odd, it seems to handle fine and have enjoyed riding it in that guise on the last few weekends, as being a bit smaller/shorter than my normal bike it has been fun chucking it about on the more twisty/technical stuff.
However, is this going to lead to catastrophic frame failure or just long term fatigue/stress.
Hard to say, but it's quite possible you'll rip the front off, which might hurt quite a lot. On the other hand, it might be fine. Depends on the frame to some extent. What is it?
Genesis io
Could run more sag to get the angle down.
I ran 110mm forks on a frame designed for 80mm forks a few years back, and snapped the headtube clean off my frame. Not something I would want to repeat.
a mate put lyrics on his soul and cracked it.
I think the kind of riding you are doing matters at least as much as the fork length.
Forgetting about the likelihood of your headtube seperating from the rest of the frame, I'm surprised it hasn't thrown your handling. I briefly tried a 130mm fork in a 100mm specific frame and other than when it was pointed downward it handled like a dog, went straight back to 100mm.
ive had a few 100mm frames
ive always hated the way they felt at 100mm so always ran mine with pikes or revs at full travel, never had any problems.
hth
I was too surprised that it still rode ok. Then again I like my bikes slack and reasonably tall at the front so I know no different.
However sounds like its a recipe for disaster structurally.
Cheers for the advice
I put put pikes on a cove handjob, 10mm more than recomended, i got 3 rides before it folded 🙁
I put put pikes
looking for a role in the king's speech 😆
I put put pikeslooking for a role in the king's speech
wrote it on my mobile.. typo....... can happen.. wished i lived in your perfect world 
sums this forum up...