Bard moderately armored feat? If I were to make a Half-elven 5 Glamour bard 2 Archfey warlock, would taking the moderately-armored feat be worth delaying a Cha ASI from +3 to +4? 

If I took the ASI my Cha would be +4 and my AC would be 14. If I took the feat my Cha would be +3 and my AC would be 18.

*I know I could simply go Hexblade rather than Archfey.  However, I think Hexblade is too strong and going Hexblade on every Warlock ever is lame.*