The AI aircraft Editor model viewer lists the following textures for the P-3 AEW
Texture list for model: jai_p-3b_aew_disc.mdl
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1: JAI_P3_8_T.BMP
2: JAI_P-3B_AEW_T.BMP
3: PROP-HS.BMP
Not sure why #1 is listed there? It is definitely not needed to paint this model.
But this might be the cause of the blurrying.
Also the standard P-3C model has more than one texture:
Texture list for model: jai_p-3c_usn.mdl
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1: JAI_P3_4_T.BMP
2: JAI_P3_8_T.BMP
3: PROP-HS.BMP