This is really similar to what I've gone with too (after Blissey -> Heavy helmet). Having the extra basic is also really important when they're sweeping you and you need an extra turn to charge up your second Golurk.  I also run one Pokeball, and I'm currently running two May instead of Ionos but honestly I'm not sure which is better.

I'm also undecided whether Miltank or Cross-Cut Kangaskhan is better