Va is a structural maximum, you are below it, no problem.
I suspect that you may be referring to
Vb / Vra (rough air speed). In that case, I'd either stay where I was because gust response is (approximately) proportional to airspeed so the aircraft should be safe at a lower speed; or, alternatively, because turbulence tends to reduce groundspeed at a fixed EAS, I might slightly increase airspeed to maintain groundspeed and stay on schedule - depending upon how critical that was.
G