Event Booking Fee Field Calculation

Hi,
I have three different prices for a conference when I set up a site using "Event Booking",
industry $950/$1050
member $850/$950
student $700/$800
the first amount is early bird fee which will expired end of May.

I set individual price as $0, then add $1050, $950 and $800 into "Radio List Custom Field Type", the problems are:

1) In the checkout page, the amount is "-$100" cause system minus $100 as early bird fee.
2) When customers select multiple quantity we say "5", then choose "industry", then in the confirmation page system only catch $1050 once rather than 3 times.

Thanks!
Nick