The exp nerfs in lower tier content are at least partially due to gear, especially raid gear. One maybe partial solution worth considering is to decrease the effectiveness of raid gear when using it in lower tier content. It would work something like this Raid gear would have full stats within the expansion it originated and higher tier content. In lower expansion content it would drop in effectiveness to approximately the highest tier of the expansion it originated in, group gear. So for example raid gear from CotF used in the RoF expansion would drop down to CotF group gear equivalence. This could be achieved by adding for instance a hidden aug that activates based on the zone it is used in applying negative stats. A lv105 character in RoF content is still going to be significantly more powerful than an in-era level/gear toon. An alternative might be to drop from CotF raid tier 2 > RoF Raid tier 4 Longer term, it might be worth looking at reducing the effectiveness of raid gear in group content overall.