As a suggestion, pick a few random spots in your yard and "dig down" 3ft (or so) Nice 2ft x 32" down holes and tell us the soil layering in that specific area. This is very critical.
If top 6" is good top soil but below this level is sand (especially beach sand) then all the top soil in the world added ontop will NOT fix the problem. Especially if adding more soil forces your home's foundation "too close" to ground level. If wondering, my front yard was like that. Top 5" of ground was good top soil but under the top soil was beach sand. Sand the house builder brought in to quickly level out the front yard (to sell the house). I had to manually dig down 2.5 ft (no kidding) and manually remove the beach sand. (thankfully, I had a 3x6 trailer and large ATV at that time). After the beach sand removal task, I bought 2 trucks of 30 cu yards of top soil. Yes, 2 extra large dump trucks. Manually shoveled it around, then through some grass seed ontop of it. The next spring, my front yard was awesome. Grass was green and it looked great even during the super hot summer months. If I would have added 4-6" of top soil ontop of the sand, it would NOT have fixed the problem. The problem of too deep of sand (under the top soil) in our front yard.
At our seasonal camp site, we have the opposite problem. The CG owner trucked in lots of top soil and added it onto of hard clay. Its base is hard clay with lots of trees - with mesh of tree roots. When it rains, the water goes into the top soil and is trapped against the clay top layer. Thus, it takes weeks and weeks for the ground to dry. Vision grease ontop of a sheet of steel. That's how slippery his ground becomes during wet season. He installed 4" weeping tile (approx 28" under ground) in the low spots and it dramatically helped. For him, leaving the base clay but installing weeping tile system was best. Especially since base glay was full of natural tree roots.
For your house and its outer "dry spots", peraps digging down a few "sample holes" and verifying its under ground soil layers may help. Help determine if under ground weeping tile system is needed (like in my back yard as well) or perhaps complete manual soil removal / replacement is best. It all depends what is under your home's ground today.