I know you won't want to hear this, chuck, but here it is...
You need to be patient. I know you're four months along, and it seems like a long long time, but it is really normal to be tight that far along.
You have been patient. You need to be more. Sucks, but there it is.
I've done a lot of stretching in my life, started martial arts when I was knee high to a grasshopper. So my body should have been better at recovering in flexibility. I think it actually has been, but full flexibiity did not come back until about fifteen months along.
I felt like my flexors came back pretty well by twelve months or so, after some slow, long stretching. Now that means flexible for me, which is more flexibility than for most. So depending on your expectations, you will be back where you want to be earlier.
But in my opinion (just mine), not at 4 1/2 months. Take it slow in stretching, go slow and make sure any stretching does not hurt. Muscles can get injured by just stretching,so slow and easy is the right path to take.
Believe me, if anyone was going to be impatient with diminished flexibility it would be someone who used to do the splits with abandon (still can't, but I can live without that). But it takes time. Go easy, no pain.
One thing you might try in a few months (I started at one year) is some light yoga. Not something aggresssive at first (I was a beginner), but light and easy.