broswerSync, Gulp, vagrant, and proxy - not a good combo?

[maxxd]

OK - I've been beating my head against this for a bit now and I give up...

I've got a vagrant box up and running on my host system. I'm using gulp with several node modules from the host system, and everything is working well except browser-sync.

My directory structure (abbreviated):

/dev
	/_assets
		/javascript
		/less
	/build
		/templates
	gulpfile.js
	package.json

Here's the code so far:

const _ = require('lodash');
const aw = require('gulp-load-plugins')({
	pattern: ['*'],
	scope: ['existingDevDependencies']
});
aw.browserSync = require('browser-sync').create();

const pkg = require('./package.json');
var themeName = pkg.name.toLowerCase().replace(new RegExp(' ','g'), '-');

aw.gulp.task('Develop', ['browserSync', 'developJS', 'compileCSS', 'watch']);

var theme = {
	srcJS : '_assets/javascript/**/*.js',
	srcCSS : '_assets/less/**/*.less',
	srcStyle : ['!_assets/less/variables.less', '_assets/less/style.less', '_assets/less/**/*.less'],
	destJS : pkg.directories.content + '/js',
	destCSS : pkg.directories.content + '/css',
};
/**
 * Set up the browser reload on the host machine when the files are updated
 */
aw.gulp.task('browserSync', () => {
	aw.browserSync.init({
		proxy: "vagrant.craft.internal",
		host: "vagrant.craft.internal",
		open: "external",
		port: 80,
	});
});
/**
 *	Development JavaScript handling.
 *	Browserify, Babelify, and uglify with in-line sourcemapping
 */
aw.gulp.task('developJS', () => {
	"use strict";
	_.forEach(_.castArray(pkg.scripts.entry), (script) => {
		aw.browserify({
			entries: ['./_assets/javascript/' + script + '.js'],
			debug: false
		})
		.transform(aw.babelify, {
			compact: true,
			retainLines: false,
			comments: false,
		})
		.bundle()
		.on('error', handleError)
		.pipe(aw.vinylSourceStream(script + '.min.js'))
		.pipe(aw.vinylBuffer())
		.pipe(aw.uglify({
			sourceMap: {
				url: 'inline'
			}
		}))
		.pipe(aw.gulp.dest(theme.destJS));
	});
});
/**
 *	During development, obviously we want the system to watch for any
 *	important changed files and to handle those automatically.
 */
aw.gulp.task('watch', ['browserSync', 'developJS', 'compileCSS'], () => {
	"use strict";
	aw.gulp.watch(theme.srcCSS, ['compileCSS', aw.browserSync.reload]);
	aw.gulp.watch(theme.srcJS, ['developJS', aw.browserSync.reload]);
	aw.gulp.watch('./build/templates/**/*.html', aw.browserSync.reload);
});

/**
 *	Production and Development .less processing
 *	Processes the .less to CSS, then minifies the file.
 *	Note that grid support is enabled and we're bablifying
 *	back to IE10. This should change in the very near
 *	future as we drop support for 10.
 */
aw.gulp.task('compileCSS', () => {
	"use strict";
	return aw.gulp
		.src(theme.srcStyle)
		.pipe(aw.plumber(handleError))
		.pipe(aw.less({
			strictMath : 'on',
			strictUnits : 'on',
		}))
		.pipe(aw.concat('all.css'))
		.pipe(aw.autoprefixer({
			browsers: [
				"last 2 versions",
				"IE 10"
			],
			grid: true
		}))
		.pipe(aw.cssmin())
		.pipe(aw.rename({
			extname : '.css',
			basename : 'style'
		}))
		.pipe(aw.gulp.dest(theme.destCSS))
		.pipe(aw.browserSync.stream());
});

browserSync initializes just fine - my browser opens, loads http://vagrant.craft.internal and my terminal shows the proper Local, External, UI, and UI External addresses. I update my .less, .js, and .html files and my terminal says 'Reloading Browsers'. But there's no browser reload...