Crapes need a slightly acidic soil base something like 5.0-5.5pH. Give them a little 5-10-5 and keep soil slightly moist but not wet. They are fairly drought tolerant. They love sun. Finally don't baby them so much as they are a tough plant. If your soil is alkaline (use a pH meter for a close guess) apply a healthy dose of sheep manure or a little sulfur. Use a acid loving plant food.
Hope this will help a little.
We all are merely gleaners from the masters who were here before us.