Take the wrapper off an remove 1 or 2 layers of wire and retest.

I had this issue on Jurassic park. The thread I found had people suggesting a rebuild of all the components. Also, double check whether the switch is fully activating. The coil was no any ones issue and I doubt it is yours

Replace that rusty plunger and the sleeve

More turns means a stronger electromagnet, we went through this recently in the lotr owners thread. So I think he's mistaken, removing windings will not increase the strength.

What components did you replace? If it was just the sleeve and plunger, that's not enough. I'll find the thread, but it was suggested to replace everything including the cup and switch. Some retailer was selling a data east rebuild kit. Need a punch for the roll pin.

Edit - here's the thread
https://pinside.com/pinball/forum/topic/tftc-vuk-issue

Not always true, more turns = more resistance, less current, weaker coil. For example your flipper coil has 2 windings. One high power and one low power. Which coil has more turns? The high power on a Williams flipper coil has 600 turns and the low power has 2600 turns.

Yes it would and it is available for sale if you do not want to mess with unwrapping your coil.

Read post 15
https://pinside.com/pinball/forum/topic/increasing-the-power-to-a-coil-remove-more-windings

In general, more windings = more force. Removing a few windings may help a little, then it makes it worse as you remove more

Yeah, but he'd have to remove half the windings to reach that point.

This would be true if the winding were not over lapping each over. When the winding are confined in such a small area the magnetism does not multiply on a 1 to 1 scale, but the resistance does. So once the coil has more then 10 to 15 layers on the bobbin then the resistance adds up faster the the magnetism making a weaker coil. Now if you made a coil bobbin two foot long and use the same amount of wire and the same gauge of wire as the 23/800 coil your new coil would be stronger and removing windings would only weaken it. But we are stuck with 2 inch coils and none of this applies to his question. That facts remain if you remove some windings as I suggested you will reduce the resistance more then the the amount of magnetism and lower resistance will allow more current, and current is what makes the magnetism in the first place. Post #3 from Chris also agrees with me.