Even though there are time I cringe when I toss a Glasso spey in a boulder garden, I still do so because they are so darn effective at ending up with a fish hanging onto to them.
This is a wonderful fly that I would not hesitate to toss in any of our steelhead rivers.
The way I get my wings to sit lower is:
1) stripping the hackle feathers (which I take from Chinese rooster necks or better yet, Whiting American Hackle capes) to almost the tie in lenght. In other words, I leave just a few hackle barbs that will be tied down when the wing is tied in and set. These extra few barbs keep the hackle from rolling out of position as you tie them in.
2) tie the far wing on first and cant (or tilt) the feathers toward you (keep the top of the feathers in the middle of the shank and the bottom of the feathers on the side of the body opposite you) with just two wraps of thread and tighten the thread by pulling up after the second wrap.
3) tie in the near wing and cant (or tilt) the feathers away from you (keep the top of the feathers in the middle of the shank right against the previously tied in far wing and the bottom of the feathers on the side of the body closest to you) with two wraps of thread and tighten them by pulling up after the second wrap.
4) check to see if both wings are the same length, if not, you can adjust them by pulling the stems of the longer wing toward the hook eye as you hold the wing in position with your left hand.
5) add two more wraps of thread toward the back of the fly that slightly overlap each other and tighten them by pulling up fater the secon wrap.
6) add the topping (if the fly has a topping) and make sure you flatten the topping at its tie down point with flat jaw pliers and bend the stem up (you already know how to do this as can be seen in the way your topping lays on the top of the wing edge) and tie it in with two wraps of thread and tighten once again by pulling up after the second wrap of thread.
7) hold the wing and topping (if the fly has a topping) with you left hand and carefully cut the topping and wing stems close to the thread wraps holding them in (for those who do not know this, the reason you need to hold on the the wing and topping stems is to keep them from moving when you cut them)
8) put a drop of Fleximent on the wing and topping stem ends and whip finish over the stems immediately before the Fleximent has a chance to set up. This finishing method produces a small head and absolutely locks the wing and topping in because each wrap of the whip finish is cemented to every other one and the wing stubs are also cemented to each whip finish wrap and the hook.
After the Fleximent dries, put two or three coats of head cement on the head with enough time between coats to allow them to dry to protect the thread and make a nice glossy head that glides through the water when fished.
This method is faster and easier than flatening the stripped hacklle stems, which is how I first learned to tie a lower, flatter wing on.