I have a problem with this statistic. It actually makes little sense at a craps table. It makes perfect sense when you are practicing at home -- but it's meaningless when you are making bets with real money.
It's not what your ratio of 7s is -- what matters is WHEN the 7s appear. It also matters WHAT the OTHER NUMBERS are that you throw.
If you throw one seven in seven rolls, but five of the other six numbers are craps (and you're not betting craps) you will lose. But let's take a worst case scenario at a $10 table with a SRR of 8:
Roll #1 Craps You lose $10
Roll #2 Point of 6 You have $10 on the pass, you add 5x odds. Total outlay $60
Roll #3 A 5
Roll #4 A 8
Roll #5 A 4
Roll #6 A 9
Roll #7 A 10
Roll #8 Seven out
The key to dice influencing (I don't use the word control because I don't think anyone CONTROLS the dice) is hitting the numbers you bet on -- not the SRR.