Keep in mind, the air affected by your mod extends up several feet above and around, so unless your leaf blower was originally used on the set of the movie "Twister", it really won't tell you much.
I think the reason your tufts point forward is due to your lack of a smooth transition, your flat wing creates this by default. I think it helps control the air in a good way for you. Short of building a complete cap, this seems to be the best you can achieve.
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