Blueberry leaves curling

svendenhowser1 starts with ...
Hi knowledgeable people! I have 2 young blueberry bushes, a gulfcoast and a biloxi in inner west Brisbane (so can get close to 0 overnight in winter and 40+ in summer). I can't remember which one is which but they were planted at the same time, in the same type of pots and the same potting mix (azalea). They are both ~1 year old. One has gone mad with stem/leaf growth but no flowers, the other has grown much slower with more flowers (which I've mostly removed) but both seemed healthy.

My problem now is the larger bushy one, has literally overnight, developed this leaf curl situation. The leaves are still green and don't seem dry/crunchy, nor fall off easily when gently pulled. Is this a nutrient situation or a disease? There is some yellowing with prominent veining on a few of the other leaves as well, which you can see in the pictures.

They get watered most days (kids love doing the gardening) and fed once a week or fortnight with powerfeed flowers, fruit and citrus and are mulched with sugar cane mulch. They also get plenty of sunlight (8+hrs).

Unfortunately I have a small garden and the ground space is filled with other fruits (2 mulberry, 1 fig, 2 raspberries and some flowers! Kids love it, although the fruits never make it to full ripeness before being munched haha..). But could it need a bigger pot?

Thanks a bunch for your help! :)

Pictures - Click to enlarge
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svendenhowser1 says...
If it was just 1 stem looking broken that would make sense, but it’s about 10 stems, none are broken..

I’ll have a look for maybe a more suitable fertiliser, maybe the one I have isn’t good enough?

The pH is about 5.5.