$5 only means you are taking big shortcuts and have only 500 combo covered. The simplest way to do this is by taking two standout favourites and 5 picks in 3 legs and 4 picks in one leg.
You may or may not decide to bias how many selections allowed in a given leg due to the 2 dividends on offer with this bet type. In general I would say ignore that and let the markets, and field sizes, bias you instead.
Have made things simple and taken the 2 shortest favs as the 2 picks for that consideration but this is as far as I have allowed the market to sway me.
For the other legs have biased selections in 2 main ways - soft track form and barriers ( strike rates DO drop off at Ballarat for some distances ) but have only allowed market prices a little sway - we want roughies in a leg or two.
So today's ticket for 500 combos is :-
ps A pity they took Megablast to NZ for a soft track today