Your thoughts needed

Need some outside opinions as I may be looking over some things so your opinions are appreciated.

I run a chase system using parlays in MLB. Let's say I want to double my bankroll every 90 days. I use a investing tool so I need to know I need to earn 8/10th of 1 percent (.008) of my bankroll every day. So on a $1000 bankroll I would need to win $8 on day one.
I play 12 different parlays so each parlay needs to win 67 cents every day.

I use 3 teams (usually the top favorites but I will leave out most teams over -250) and run the following parlays

Tm A and Tm B
Tm A and Tm C
Tm B and Tm C
Tm A and Tm B -1'
Tm A and Tm C -1'
Tm A -1' and Tm B -1'
Tm A -1' and Tm C -1'
Tm B and Tm A -1'
Tm B and Tm C -1'
Tm C and Tm A-1'
Tm C and Tm B -1'
Tm B -1' and Tm  C -1'

I now it looks complicated but I have an Excel spreadsheet that does all the work.

So on day 1 I have to earn 67 cents ( Remember this is an example as few sportsbooks take bets this low). If I lose I then am trying to win the original 67 cents, the lost bet and the 67 cetns for day two.

I never am betting at anything less than even money, with most of odds being +150 thru +300 on some of the run lines.

It's slow boring betting but I haven't had to bet over 5% of bankroll on any single bet yet.

With my $1000 starting bank example I would currently have doubled once and about half way to doubling again.

If you see any pitfalls or anything I'm overlooking please tell me as I am making sure I have all my ducks in a row before the NHL starts.

Thanks