Honestly the more I compare I'm leaning towards the larger ones too! It is so white and sparkly and you're right, just has more presence. It just feels "extra" which is a little wonderful considering everything right now. Opens up a can of worms though as it's almost the same size as my pendant and I would prefer a little more contrast. Maybe the next project!
If you decide to keep the .75s and would be willing to sell on the .5’s rather than return them I would definitely be interested in buying as I missed out on the sale! No bother if you have other plans!