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You can prune these at any time, but if you are worried about a fungal infection, then you should prune these during dormancy.

A mature Kousa Dogwood reaches 25 to 30 feet with an equal spread. You will want to space your trees for their mature size.

I've read that it can take up to 7 years for dogwood to bloom. On the other hand, there are many growing practices that affect blooming. Dogwoods need watering during dry spells all the way through fall. Flower buds are formed the previous year so if you see signs of heat or drought stress, the buds are the first to suffer and the tree may not set any buds if summer has been difficult. Blooming is best in a site with at least 4 hours of direct sunlight. Remember that tree roots go past the drip line: don't put any lawn chemicals or fertilizers over the root zone. (Too much nitrogen from lawn fertilizer will spur green growth in the tree at the expense of flowers.) https://www.gardeningknowhow.com/ornamental/trees/dogwood/dogwood-tree-not-flowering.htm

Buds are formed on dogwoods the previous fall. When frost hits after warm weather has enticed the buds to start opening, the bud fails. A general tree fertilizer at the recommended rate is a good idea for the first 3 years to keep the tree vigorous and healthy. In addition, watering during dry weather is still necessary this year. With weather becoming more erratic, one wonders if dogwoods and magnolias will be regular performers in the northern edge of their range. Lets hope so as they are lovely trees.

The outward appearance of curled leaves and yellow-brown edges is of heat or water stress. If you think the plant has adequate moisture for the weather conditions - excessive heat and wind increase water needs - then problems with roots may be the cause. This is a much more serious issue. Dogwood can get root rot or can developed cankers that impair flow of water to the leaves. Although Kousa dogwoods experience fewer pest problems than the native species, nothing is problem free. Here is a rundown of potential dogwood problems. http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/visual-guides/flowering-dogwood-problems.aspx

Cool spring temperatures or any winter damage can effect spring leaf out and blooms.
Since last year was your first bloom; it is still a new tree.
A simple soil test can help you determine if a boost of fertilizer may help you tree.
Your County Extension Office can help you with this.
Here are some links to help you.
https://www.gardeningknowhow.com/extension-search
https://www.gardeningknowhow.com/ornamental/trees/dogwood/fertilizing-dogwood-trees.htm
https://www.gardeningknowhow.com/ornamental/trees/dogwood/growing-kousa-dogwood-trees.htm