Split Menu — setting distance of menu items from central logo

Hello..

I used this method to make a split menu with central logo, and have been given good advice by Tom in this thread about getting it to display well on mobile, and I'm now fine-tuning.

I would like to bring the menu items closer to the centred logo, but doing that using padding on the left and the right of the menu is not a very good solution in terms of repsonsive design, as they quickly run into the central logo.

Please could you advise of a good way of bringing the split menu closer to the logo on both sides, but maintaining a minimum distance?

Thanks!