chicken manure pellets ok to feed all sorts of veg?

[Two_Sheds]

I thought the pellets would improve the soil condition,

No, not really: they're a plant food, not a soil improver as such.
Feed your soil, not your plants, is an oldie but a goodie: that means making as much garden compost & leafmould as you can.

If your soil is very very poor you could build lasagne beds like we did at school

No amount of plant food will do anything if the soil is poor to start with

[hamamelis]

The test I did was using tubes and powder, and I wouldnt have considered it a cheap one. I tested the pH, nitrogen, potassium, phosphorous all of which were crazy low. I did use water from the butt as it recommended not using tap water.

Just double checking- your pH was crazy low, or crazy high? Low would be extremely acid, not alkaline!