So I know LH is more likely to go from the B/C gates at T5, but is there any historic data per flight, and specifically this one?

I'm going to have a gaggle in tow next month, all in J and I'm thinking if there is a high percentage probability that we'll go from B/C, I'm going to head us all to the B lounge early on. But I would like the odds well in my favour in case I have to drag them all back to A in the tunnels.

Also, I know the on time record of this flight used to be pretty bad, has it improved at all recently?