Yeah my Volta girl is just shy of 6ft as well.
The easiest way to tell the difference between a normal from the other localities vs. one from the northern Volta Region is head size. It is hard to capture in pictures but in person it is quite obvious that there is a difference even with smaller animals 1000-2800g. So yeah, they are just large normals and they grow larger then the other localities. They also are rumoured to grow at a faster rate then other localities, usually when most female normals hit 1000g these are 1300-1800g. However, they are sexually mature at the same time rate. They typically throw clutches over 10 eggs even when they are younger. My girl was 3200g gravid and had 11 fertile eggs. Now that she has laid, it looks like her standing weight was right around 2400g. I do understand that other localities can put these numbers out when they are that size though, it just isn't as common. The genetics seem to be a polygenetic thing, so we will have to linebreed to keep the Volta genetics in our designer mutations but in theory you can create designer mutations which have more size and higher egg production. Meaning eventually you'd be able to have better odds of hitting new mutations, like we see with other pythons like retics.