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hoping it would oscillate/swing for longer
Yes, in the sense that mass and therefore force increases as the cube of dimension but drag only by the square.
By adding mass at the top, you're decreasing the effective length, which would shorten the period in the case of an ideal pendulum, but you're increasing the moment of inertia so the simple pendulum approximation doesn't apply and you need to do grown up maths.
TL;DR: Add mass at the bottom, it's simpler and will have less effect on the period
gbj_tester
@moocher
I'm hoping it would oscillate/swing for longer. But I don't want to go to the effort of making more weights unnecessarily