With my puny bankroll compared to yours,not really for me to make decisions for you Mr J.
And you've probably been there done that,however.
Have you considered for example on the Saturday you might have 4 selections,all being at even money.
Instead of investing a grand on each,perhaps 1500,1200,800 and 500 or something similar.
Or better still bet to chances.
If you think Hawthorn might lose by 20 points and can get +43 at evens then back them as though you were getting +23 points on a genuine evens chance.This equates to about a 3's on chance so back them as if they were.
I realize you are still learning the ins and outs of AFL betting,as we all are,and maybe someones got some ideas to share rather than sharing their sorrows and successes.

Cheers Mo.