RoR is 10.21%
James Patterson,
I ran a 400-million hand sim in CVData for a 6D, S17, DA2, DAS game with 75% penetration for a HiLo counter using complete indexes with one other player at the table: since you failed to specify these variables, I simply guessed.
The counter uses your betting strategy: wongs in at +2, wongs out at 0, and bets $15 (3 $5 units) at +1 and $25 (5 $5 units) at +2 and up.
The results show you making 0.8382 units/hour (assuming you see 100 rounds per hour), with a standard deviation of 19.1731 units/hour. Since your bankroll is 500 units, your RoR is 10.21%.
Other stats: you play only 12.1% of the rounds (only 49,935,848 hands played, including splits, in 400,000,000 rounds seen), your action is $325.51/hr, your win rate is $4.19/hr, your IBA is 1.498%, your SCORE is 19.11, and your N0 is 52,326.
As you can tell, this method of increasing your BR would be a real grind!
If I guessed wrong on any of your game's particulars or your count strategy, let me know and I'll rerun the numbers for you... but unless the game is much, MUCH more liberal (say 5.5/6 pen, Surrender (late or, even better, early), 300 rounds/hr speed, etc.) the results aren't going to be significantly better.
Hope this helps!
Dog Hand
P.S. I'm a big fan of your novels!