The dual 6095's should be the basis of the flow, you want those to produce a directional current and the 6208 would produce an additional wave current which is very effective at getting to dead spots behind rock work, but the flow lacks direction it is just a lift and suspend wave and they work together very well but one shouldn't replace the other and the directional current is more critical in most cases.
Yes, any sort of wave or surge flow that results in a shifting of weight reduces tank life, however, a well made tank will "last" for 20-25 years. But likely be scratched, etched, and just generally damaged beyond where you would keep it after 10-15, the loss of 10-15% of its life at the end is not very consequential as a result, if it is a well made name brand tank, properly installed on a sturdy, level stand, I would not worry about it.