How to get whole image exported from Google Earth Engine?

I used the LANDSAT 8 TOA data to create an NDVI image. I want to export the image to my Drive. I have most of the code and it works, but I can’t get the whole image in the export. It should cover the state of North Carolina, but I only see about 2/3 in the exported TIF. Also, the colors are apparently missing. In Earth Engine, it draws with green, but the exported image is greyscale or similar.

var center_pt = /* color: #98ff00 */ee.Geometry.Point([-78.833013671875, 35.0]);

var cloudMNDVI = function(image) {
    var q = image.select('BQA');
    var c1 = q.eq(61440);
    var c2 = q.eq(53248);
    var c3 = q.eq(28672);
    var mask = c1.or(c2).or(c3).not();
    var imag_mask = image.updateMask(mask);
    var ndvi = imag_mask.normalizedDifference(['B5','B4']);
    return ndvi.set('system:time_start', image.get('system:time_start'));
};

var nc = ee.FeatureCollection('TIGER/2016/States').filter(ee.Filter.eq('STATEFP', '37')).geometry();
//var ncBase = ee.FeatureCollection('TIGER/2016/States').filter(ee.Filter.eq('STATEFP', '37'));
//print(ncBase)

var nc_l8toa = ee.ImageCollection("LANDSAT/LC08/C01/T1_TOA").filterBounds(nc);

var nc_NDVI = nc_l8toa.map(cloudMNDVI);
var nc_NDmax = nc_NDVI.reduce(ee.Reducer.max());
var landMask = ee.Image('CGIAR/SRTM90_V4').mask();
var nc_best_landmk = nc_NDmax.updateMask(landMask);

var ndviVisParam = {min: -0.8, max: 0.8, palette: ['65eaaf', 'c2f1ce', 'daf7e5', 'a6f79d', '44f35e']};

print(nc_best_landmk)
Map.centerObject(center_pt, 6);
Map.addLayer(nc_best_landmk.clip(nc), ndviVisParam);

Export.image.toDrive({
  image: nc_best_landmk,
  description: 'imageToDriveExample',
  scale: 30,
  region: nc
});

This is what the export looks like:

In the export script of the Tasks section, where it prompts for some export parameters, I’ve tried 30m, 300m, and 1000m. It wouldn’t even start with 30m, but with 300m and 1000m, it’s made the same image for export, one shown above, each time.

How do I get the image that covers all of N.C. and has the same colors as this into the export?

EDIT – I saw the answer from Madeleine and ran the process again. I made a screenshot of the Task and even though it’s hard to see, you can see the image is completely drawn as I was completing the settings for Task. The exported image from this last process is also only partial, like the one I already included when I first wrote this question.