My question is this - and I only ask this because you're new and I don't know your experience level:

Are you turning the High or Low end adjustment? (See pic)

The next thing is, The Evolution TPS is an excellent engine, but sometimes they come out of the factory improperly set up. So even if you ARE turning the correct needle, 1/8 turn is probably not enough.

Here is what I would do:

First, remove the pin in the side of the High End needle that prevents you from turning it too much.

Bring the engine to as high an RPM as it will go and start adjusting the needle.

Once you get it to full RPM, see how well it transitions from Low to High and back. If it does this poorly, report back here and I'll go into detail as to how to adjust the low end on a TPS