Suggestions, yes- go get trimix certified since it's safer and a lot more fun- as in you can remember everything you saw. You'll also learn other techniques along the way to help you deco out in half the time of your wrist computer.
Now, not that I would ever suggest or condone such deep air dives, I have to admit to doing more than a few of them in the past.
When I used to dive an Aldain I fouund that the "Canadian Navy Tables" could plan out my deco obligations to within a minute, or two, of the actual computer time. It's not the best deco program out there these days, but may match up with your computer better than any deco program out there. Expect deco times to be at least double of what the US Navy tables state- which I would NEVER use for actual deco dives. I know of a few old timers around these parts with new hips because of their love of the US Navy tables.:crutch
Now, if you still aren't going to do it the safe way, as in trimix, you might do yourself a favor and dump the computers and start using a decent deco program, I've always liked D-plan, so that you can "shape" your deco a bit better and have less post-dive fatigue and maybe even save yourself a couple of minutes- in the correct areas. It also gives you a back-up when your computer dies on you- and if it hasn't yet, then you haven't been diving long enough.
If your still insistant on doing this on air, you might as well check out an Extended Range Course to learn some other details to make it safer- but still not as safe as trimix. My friends who teach extended range charge exactly the same for that course as for their trimix course- to try and discourage it as much as possible.
Last thing, besides taking a trimix course, I hope your at least using doubles and iso-manifolds, and not bouncing it on a single tank, so that at least you have a hope if it hits the fan down there.
Jon
