Another Charging Question

So the car is a 68 Valiant /6. When I got it every thing was stock and wiring harness was in good shape and not hacked up. All connection changes I've made as crimp, soldered, and shrink tubed. I've since done the HEI upgrade so all wires going to the ballast have been soldered together and are going to the upgraded dual field VR and 78A (I think might be lower) Alt. I bypassed the AMP gauge by running a 10ga wire straight from the Alt to the starter relay (currently unprotected) and completely removed the original red power wire from the bulk head connector. Ive upgraded the headlights using two SPST relays mounted in a sealed box under the battery, ceramic headlight sockets and 12ga wire pulling from the starter relay (that removed light flicker and idle). I tested my IGN switch and seemed like I was loosing over .5V through the switch so I changed it. Ive been working on swapping the dash, parking lights, and tail lights over to LED to reduce the amount of draw on the system. My problem is at idle lights off I'm only charging at 13v and off idle 14.2v. With lights on at a stop light it drops all the way down to 11.7v. I've double checked all grounds and added a few more (one going from the VR to the alt body). Can I change the ALT to something better or change the pulley so it spins faster or should I be looking further into the wiring harness. One test I checked was key on (motor off) ground to the blue/white wire at the bulk head connector was showing almost .7v different than static battery but not sure from what.