Question
At the end of the 1st full year out of the bucket and into a drought ridden ground site that was regularly watered once or twice per week with 1-3 gallons from July 07 to date, and on Memorial day was circled with 6 Miracle Grow fertilizer spikes, plus one 1 gallon solution of Miracle  Grow in late June when  the ~8' 4 cane Arapaho Crape Myrtle exploded with bright delicate red blooms just before being flattened and whipped like a paint shaker by a tree felling, cane loosening wind storm which hastened a puzzling early bloom dropping, i. e.,4-5 weeks. Stronger later blooming myrtles are just peaking. Apart from the storm damage, can you explain why this characteristically repeat blooming hardy Arapaho bloomer has slowed to an apparent stop?

Answer
Just a suspicion, but are you familiar with the symptoms of Powdery Mildew on Crape Myrtles?

Technically, your Arapaho suffered a basic breakdown leading to premature senescence of flowers.  You did not mention your location, so I am limited in what suggestions I can make, but if your region's humidity is very high, or if certain other factors are present, Mildew will take over the farm.  Winds are very drying when they come without rain and this can stress your Arapahos enough to bring about the semi-dormant state it seemed to regress into.

Lots of research is being conducted to identify causes of senescence in the plant kingdom.  As this question in 10 years and I'll be able to write a whole volume on the care, feeding and flowering of these beautiful trees.