What about a YoYoJam Black Knight? It is more rounded, and is 71.5 grams, but bit heavier than your 65-68 grams thing. It’s not exactly small, but a good Yo-Yo to have for any collection. Ask Evan.
YoYoJam Mini-MoTu fits your preferences. It is 64 grams, but we can all go a gram lighter.
Axiom is 65 grams, and very good at slacks. Very good for a player.
Meteor? It is 64 grams, un-responsive, long spin times, and not so sure if it is big.
New Breed looks like a perfect choice for you. It is 68 grams, un-responsive, has a very wide gap, rounded, not exactly small, but is worth it’s size, and YYE just restocked new colors yesterday. Not to mention the flashy blue. :o
There are many more, but I listed the ones I could find. See what you like.
Anything but flat rims, I already have a DV888
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And yes I am aware that the P2 and M1 has slightly angled rims.
Anyways, I’d say 5150. Even though it is a bit under your weight, I think you might like it. ILYY is also bringing their Rocket to the field which won’t come out in a short while, but it will be worth the wait. And I think the Pure would be a good choice as well. I guess it’s made for 5a, but I don’t think that will compromise the 1a play.