I gave this a go and tried a bit of a different method, first I gave my text a linear fill thus eliminating the rectangle, and I used in my example a blend between two ellipses I used one white one with an elliptical transparency and one smaller yellow one.
I clipped the blend to the text. This doesn't eliminate the outline but unless it's just because of the colours I used it seems to make it much less noticeable. I had to zoom in to 1000% before I began to see it and even then I needed my glasses to be sure. It appears only where the colours are blending.
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