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It is likely to be in the "grey area" of between 6 and 7... This will usually make the blooms be anywhere from pink to blue, and in between. They really start showing colors either above, or below those two parameters. What method are you using to check soil pH? This can be difficult to do without the proper calibrated equipment, or previous knowledge on taking manual soil samples. Soil meters tend to give out false readings unless the conditions are just right.

An inch or two is not something to be worried about. Digging them up would do much more harm than would be done by the soil line.

In fact, this is proper practice since rain will compact the soil down over time. You wouldn't want the rootball to be sticking out later, as that can cause some issues, potentially.

Your shrubs will be nice and happy as they are!

You will have better luck rooting a stem cutting from hydrangea if you do it in the fall. But what the heck, give it a try now. Here is the process: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-propagation.htm

In zone 5, it may still be too early for hydrangea to start growing. It depends on the cultivar, how much sun it gets and if the soil has warmed. Each shrub has different needs. In general, shrubs that bloom in spring are pruned right after they bloom. They form flower buds the previous growing season so early pruning removes flowers. Summer bloomers, July and later are pruned in early spring. These shrubs usually bloom on new spring growth. The link goes to an article on pruning shrubs. https://www.mortonarb.org/trees-plants/tree-and-plant-advice/horticulture-care/pruning-deciduous-shrubs

Your soil may have too much Nitrogen, which can cause lots of green foliage and not flowering.
This article will help you.

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm

Most of Delaware is in Zone 7a.