At the moment, the 'Dark Earth' looks a tad light, but only a tad, and as you mentioned, a bit yellowish. However, this is in line with a faded, weathered example, and I think that once it's had a gloss coat, and then the matt finishing coat, both of which will very slightly darken the shade, it should look fine, especially with the decals on to break up the overall effect.
The colour chip Geo posted looks very dark to me, even allowing for monitor quality and transferring the chip to an electronic, digital image. In the past, I've sometimes lightened Humbrol No.29 Dark Earth to suit, as it has sometimes appeared too dark once the clear coats have been applied, something which is even more noticeable with Xtracolor enamel, and I believe both of these paints are closer to the full-scale shade - slightly too dark for a model from 1/32nd scale down.
Compare your model with the pic of the BBMF Hurricane, taken in full, strong sunlight, and relatively new paint (this year), kept spotless by the 'Flight.