AJ is deciduous and late into leaf, so screening ability is poor, and a lot of people have difficulty getting it to grow.

Quick fixes for screening are always difficult, because something that starts fast continues fast and can become a problem.

I know it's boring, but I would recommend laurel (ie evergreen prunus spp) to provide easy rapid screening without leyland problems. The reason it is better than leyland is that if you let it grow too much you can cut it back hard as you like and it will come back (unlike leyland where if you cut back to the brown it never comes green again). Also you can get flowering forms. And once it is to size, it is quite easy to prune to keep it to that size, becuase the new shoots are cut through easily provided you don't leave it too long.

If you are a bit more patient, there are all sorts of dense medium/large evergreen shrubs that will be big enough to screen almost as quickly: arbutus unedo (can be trained as a bush, choose the small form) aucuba, choisya ternata (mexican orange blossom), euonymous fortunei, certain ceanothus (california lilac), certain osmanthus, photinia, certain pyracantha, etc.