Fox Brand New Lifter Ticking

I think that lifter is made a little different internally causing the oil flow. The rocker pedestal may also need a shim removed or added for correct lifter pre load. The stud mount aftermarket rockers adjust by the torque or the turns of the stud adjusting nut. The factory ( or factory style ) rockers may need shims to adjust rocker pre load. Usually, lifters would be replaced as a set or with the same brand.

Check and see how easily the push rod spins and if there is any play at the pushrod / rocker end. The lifter needs pre load to also help stop noise. If the push rod end is worn the lifter will be topping out and compressing a tiny bit with each valve stroke. This doesn't really answer the heavy oiling issue...if its an issue at all. The other lifters may have some carbon inside them or the passages may be designed a little different ( different brand ). It isn't uncommon for a lifter to push oil out unevenly from rocker to rocker at idle rpm. If its ticking something is not right.

A sticking valve can also cause a tick at the rocker arm. It would be associated with a misfire or stumble. A broken spring will also cause a tick but you'd be able to see it, more than likely.

The lifters when new have a hard time pumping up and getting their internal valve working
Soaking in oil overnight like you did helps but sometimes they do just as you experienced (not pump up)
Glad you got it handled

Maybe you should have got a Ford lifter.

Nice! Just took some time to pump up/build pressure. Glad to hear all is well.

Glad it pumped itself up. It's always nerve racking when you hear noises after replacing a part.