Your target macros seem pretty close here, I think - didn't do out the math but it looks fine. The one thing I'd warn against is the mashed potatoes. I love mashed potatoes more than anyone ever should, but they really are just useless carbs in the form of starch. You could substitute in some more pasta* or some form of whole-grain bread for more carb support in that slot.

Or, if you want (and this might work better), you could take that out altogether and put some carb powder in with your preworkout shake. I personally put in about 25g maltodextrin in my shake; that or dextrose should help you during your sets, although you'll want to watch out that you don't crash.

*when you say pasta, what kind do you mean?