Moving Solanum Glasnevin

I bought and planted a solanum glasnevin last April/May whilst it was in full bloom. It did wonderfully. I didn’t realise how much it would grow, so I moved it a couple of weeks ago (early April) before the buds started blooming. It is about 16ft further down the garden. It has the same aspect and light, but now the leaves are going yellow and it’s drooping.
I did soak the root ball before replanting and watered it every day for 4 days. I fed it with “liquid grow more 7-7-7” (nitrogen 7%, ureic nitrogen 4.9%, phosphorus pentoxide 7% (3.1% P), potassium oxide 7% (5.8% K)).
It is beginning to bloom.
What have I done wrong and how can I help it?
I did soak the root ball before replanting and watered it every day for 4 days. I fed it with “liquid grow more 7-7-7” (nitrogen 7%, ureic nitrogen 4.9%, phosphorus pentoxide 7% (3.1% P), potassium oxide 7% (5.8% K)).
It is beginning to bloom.
What have I done wrong and how can I help it?

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It was doing absolutely fine supporting much growth before I moved it. The only thing I could think of was I damaging the root ball and over watered it. Although it did seem to go downhill quickly once I put the liquid feed on it. I checked I hadn’t made it up too strong. I also wondered if the feed goes off, as I think it is a few years old.
As you say, they put on growth quite fast anyway. Just continue to water it generously around the base early morning or late evening time, they will hopefully revive and give you a second flush later in the year.
You did right to water it heavily. When you move a plant in dry warm weather it's important to do so! The plant is in 'critical condition' for a while, until it's roots have recovered.
Rather than cut the whole thing in half you could do it carefully, making sure you retain some flowering stems. Obviously remove the wilted stems first. But if it survives it will grow away quite vigorously and flower in any case.
Regards, Linda