O'Driscoll has played with one central striker in their away games since taking charge in January and he insists this system is the best option for the rock-bottom Robins.
"We have played the same way for the last nine or 10 games," he told the Bristol Evening Post. "We have had limited possession in all of those games, but still produced decent performances.
"With what we have here, that is the best combination for us away from home. It makes us solid and compact, while still enabling us to be a threat going forward."
Strikers Ryan Taylor and Jon Stead remain sidelined as O'Driscoll plots a final push for Championship survival.