Watch the 1-5-6-4 Shuffle #2 online guitar lesson by Andrew Ford from Bass Groove Survival Guide
Same basic groove but adding some short phrases and triplet figures to connect the chords and give it some lift. Avoid the tempation to rush when you know a deviation or busier figure is coming up. Anxiety will cause you to do that. A couple things I do are always try and look ahead in the music, or think ahead if there is no music, and I write the names of the notes above or below the staff to assist me when the pressure is on, there are no rules, anything that helps you get the job done.