Couple of points I've learned by trying... First if you want 1000 of each type of ingot your statement should look like [Ingot:P1:1000] That would pull in 1k of each type (including Uranium)

Assembler's are a bit of a messy business, I started a thread on them and no one responded so I started experiments.

Best I have found is to leave the assemblers alone, don't tag them, leave the convyer system on and let them pull in what they need from your ingot storage.

I've found with the sorting mod turned on the assemblers do manage to pull the materials they need, but much more slowly, I think there is some competition going on where the sort mod is trying to keep the ingots in the storage location and the assembler's eventually "win" and pull some each tick.

I've also found that building smaller quantities of parts at a time helps with that (100 at a time).

At one point the author was going to make it so that if you put the assembler into dissassembly mode, that the mod would be allowed to pull out the ingots. I'm going to test that next.