OK. I never saw a p-ch used as a sinking device. So it is seeing a gate voltage of something like -2.8, and is not turning on all the way so you're getting the excessive drop across it. Too bad you are out of IO pins. You could combine the two switches onto one analog pin and free up a pin. Then use 2 n-ch. But the blinking light is what most people will want!

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra