think you're very right with changing sides lapwise, even Terry has recommended. But changing sides (no matter what intervals) is important for long-term. So we should allow for from the beginning.
Your swims are fairly long. Did you experiment with other patterns, as 2-2-2-3... or 2-2-3... or changing sides in lap's mid? Breathing with various patterns may have positive repercussions to drag reduce and over all Relaxation.