Timing Error large enough to cause problems?

Hi again, My CLOCK TO OUT timings are going off by a small amount (requested 4 ns, got 4.112 ns) on a databus going out of the chip. Will this cause problems in real life? Should I raise the drive strength? I've configured the IOBs to use FAST 12 mA LVTTL, the data is clocked at 40 MHz. I am using a Xilinx 2V1000-5 FG456. There are 32 such outputs driving a single IO Bank, I'm worried that going beyond 12 mA will cause SSO problems on that bank. -Jim