In my experience this is typical of the U1000/Super 70s and Ibanez & Greco guitars. I think they were going for maximum tonal differentiation between the neck & bridge pickups, output level be danged. I have a '74 Greco LP copy where the neck Super 70 measured ~8.6K while the bridge was ~7.4K. So I swapped 'em! ☺
The TV Jones Classic/Classic Plus set is the way to go IMO if you like the Filter'Tron sound with just a little more oomph.
-Dave-
As far as i know, Super 70 has evolved over time. Until it was branded "Super 70" we had a Maxon Alnico 8 pickup, maybe common to Ibanez and Greco ... But, after, when we saw a branded Ibanez "Super 70" and U-1000, there is no evidence that it is the same pickup.
Only for Ibanez Maxon made A LOT of differents pickups, it's hard to beleive he was not able to do some original pickup for Greco. U-1000 U-2000 etc, should have something different from Ibanez Super 70 ...
In addition, Super 70 itself has evolved from year to year. From 1975 to 1976, some differences ... 1977, wax potting starded, differences in the sound again... in 1979 some Super 70 will have with ceramic magnets, and some other ones will stay Alnico 8 magnets ... At that point, U-1000 has almost nothing to do with Super 70 ...
I have more than 10 vintage Grecos, with all kind of pickups, and none sound like Ibanez Super 70.
The confusion probably comes from the time when Greco was not yet popular outside of Japan, and the owners of Grecos wanted to take advantage of the fact that Ibanez Super 70 was better known.
Now, with the internet, Grecos is sufficiently popular and no longer needs to compare itself to Ibanez to be known ...