@Browner: Thanks for the link. I will check it out and see if my plan is close to what experienced people do.
This is what I'm intending as of now:
Openers and following lifts
150, 165, 175
110, 120, 125(130)
180, 190, 200
2nd lifts total 475
3rd lifts total 500(505)
It is possible that I could add 2.5kg to my squat and dead for the meet but I'm going to stick to my plan because I'd rather get a 500 total if possible. Missing a final attempt will immediately make that impossible.
I am quite expecting that meeting all the IPF rules for what constitutes a good lift will be bad enough, especially for bench.
If I were to go for 200 on my second deadlift attempt and get it then I would have the luxury of a higher third attempt without compromising my target total of 500. However, I don't know how long I will have between lifts? I do know that 200 will take something out of me and so a subsequent higher lift may well not come off the floor.
I think if my bench is down 5kg on the day, I may try to get it back on the deadlift.