Pelotapete,
I would use the same $28 and drop
8/12/4
8/3/5
8/4/7
8/5/4
8/6/125
those are the hardest when the 8 runs perfect
I would then use that saved $8 and play $2 trifectas
8/12/56
8/3/6
8/4/12
8/5/3
and then stay steady $1 trifecta on
8/12/7
8/3/127
8/4/36
8/5/127
8/6/34
or you could bet .50 cents on the 8 I suggested to drop, and $1.50 on the ones I suggested at $2. That would still be $28
take a look and see, I'm sure you could use the same investment and yield more profit!