The first problem described has been done many many times and has no name. I'm having a harder time picturing the second problem, but from your description of the caked chalk I think you have your answer.
I recently got back from a short bouldering trip to yosemite, and when i was there, for the first part of my tip, i didn't have a guidebook. I went around trying the coolest lines i could find. A week later, i came back with the guidebook and could find all but two of the lines i did. For me, i thought they were obvious lines, and was shocked they weren't in the guidebook. The guidebook said to report first ascents to supertopo, and im curious of the grade/if they were first ascents. So, the first one is in Camp 4 Center, and starts on #64, but traverses across the lip, and tops out with the mantle on #62 (this is page on page 127). I thought this to be a v4+, but possibly easier, since it was 100 degrees when i did it.
The second one is also in Camp 4 Center and is between #5 and #8, on the arete, where there used to be a tree (and the tree is still in the guidebook) (This is page 122/123). Once the tree was cut down, it left a nice line with a stand start starting on a good undercling, you move your right hand to a sloper, and do a bad gaston move, and throw to a sloper/jug, it then tops out on the slab near #5, this one was highly chalked so i doubt it was a first ascent. It felt about v8, maybe easier because it was another hot day when i did it. But yeah, i would love to know if you have any info on those climbs, or know if they've been done.