I wish to offer a final thank you to everyone in this thread who offered advice, guidance, and answered my many questions.
This morning, I finally completed two new legendary items and gave them a whirl. Even using mostly Uncommon components, the improvement is significant, such that I can easily complete level 135 Missions. The new legendary items may be enough to take me to level 140, though I will continue to pursue equipment upgrades via other paths.
Easy Missions continue to serve as my primary path to progress and improvement. If the Mission system offered equipment, I would engage in a much broader selection of Missions. As things stand, enemies that reach me inflict a lot of damage. Therefore I must select Missions wisely to avoid getting swarmed.
Sophie the Enchantress - Creator, Dreamer, Explorer - Happy yet Sad - Seeker of Beauty and Wonder
I wish all of you many successful and happy adventures., brave Ladies and Lords of Middle Earth!