Gem.
The damage is done to the aircraft mainly in the fore and aft axis,when the majority of bending can take place. As you said in your post, as long as the lateral diplacement is confined to between the left and right stops no bending can take place, but, make sure you maintain the fore and aft position when rolling the A/C parallel to the slope.
The really critical time that damage can be done is when running in sub-min pitch.
Similar damage can be inflicted by using too much in slope cyclic when nose-up slope landings/takeoffs are made.