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I do not claim ot be a meteorlogist, but have been watching huricanes as a hobby for many years. (Near SE Texas Gulf Coast). My experience has shown that once storms get to the Category 4 or 5 Level, Mesoclinic influences are not near as prevalent. (e.g. Gilbert, Hugo, Andrew, Camille) A serious trough by sway or turn this storm maybe 10- 30 degrees, but at this point I don't I see a right turn happening. (I hope)

Well...strong storms do influence their environment. The best example you listed was Gilbert. It traveled at a 290 for most of its life due to the fact it built a ridge to it's north. However, storms will react to the mesoSCALE:-) environment when the trf is strong enough....especially if they are in weak steering flow. What will (or should) eventually turn Izzy to the north is a building ridge over Florida/Eastern GOM. this ridge looks like it will be oriented N/S so the steering will turn it north. The only thing left to determine is how far west does it drift before it gets pushed north by the ridge. Think the eastern GOM is off the hook now...and it could drift into Central Mexico before the ridge develops...or it could really slow down and wait 3 days or so and then move N into Central Louisianna.