the Problem is shen already is strong as it stands, he is hard to Play, high learning curve and now with the recent nerfs to his clear he is unviable for the jungle and his laning clear is shitty too, but it had to be necessary. shen is in a strong position and balanced as hell, his global pressure is on par with tfs, he has a free tp he can pack in that defends enemies from damage, he has percentage health damage on 3 aa every few seconds, he has an AoE AA block that applies to every teammember inside the circle, he has a Taunt thats massive in comparison. and he can proc a shield every 10/4 seconds depending whether or not you hit champions with your offensive skills that scales with his max HP terrificly strong.
besides, he is a full tank. you dont give damage to tanks, thats the very reason why some are reworked right now like zac and maokai for example. if already then slightly, and i mean very minimally, adjust his numbers, but dont buff any damage.