Picked up this little tip the other day while gybing in moderate winds (15+ kts), all you experienced sailors probably know this already...
I was sailing downwind, main traveller all the way out, mainsail sheeted way out. Had to change directions slightly, which would require the boom to come across and the sail to fill on the other side.
So I brought the traveller back to near center, began sheeting in the main, all the while maintaining a course slightly off from downwind to keep the sail full. When the main was mostly sheeted in, I moved myself over to the other side, grabbed both lines (from the block and from the traveller), decleated both, and initiated my gyb. As the boom came across (rather quickly obviously) I was able to absorb some of the shock and jolt from the wind catching the main by loosening my grip on the lines ever so slightly. Gloves recommended..

Was able to then continue my new course, letting both the traveller and mainsheet out. The boat didn't lurch (and the rigging take such a shock) on the gyb nearly as much as if the lines had remained cleated.
Just passing it on, hoping other skippers out there find it useful.