Hello,
I have read your detailed project description and I would like to work on it. I agree with your deadline and payment/bonus proposals. I will do my best to get it done in 7 days.
The math part can be optimized, proper projections can be used and additionally, a multithreaded processing can be implemented where possible to speed things up if needed.
Please contact me to discuss further details and start the project.
Cheers,
G.