I think it's really great when people really dedicate themselves to their flexibility, but I would just offer one word of caution: don't go too hard or too fast. Sharp pain in a stretch means you've hit the
stretch reflex, which will set you
back in your flexibility.
Flexibility is all about consistency. Make sure you're doing your mobilization exercises every day, but do rest when your body asks you too. Rest (even though it may not always feel this way) will help your muscles/tissues adapt to the changes--and kind of seal the deal so you loose less of it over time.
There are a few "problem" spots for front splits--namely the front of the hips and the hamstrings. If you can get a really great release on both of these before even attempting your splits, you'll see much greater gains. Practice deep lunges (emphasizing the hip flexor) and forward folds (straight legs, standing, hanging your head toward the ground). Also, roll on a foam roller to find any tight spots, and either roll or massage those away (this helps more than you can imagine).
If you're not familiar with
PNF stretching, get to know it well! It will be your best friend in this endeavor. I typically recommend 4 rounds of 10 second contraction followed by 5 seconds release (yep, that's 1 minute).
Also, remember that your muscles are meant to move your body in many different ways--and they're all connected. Only stretching your legs forward and back in your front splits stretches only those directions. Try this one: start in your left splits, and try to keep your feet exactly where they are and rotate through your middle splits to your right splits, then go back. Try doing this back and forth 3-5 times.
I've been working on some training-related progressions for middle split flexibility. It's not quite finished yet, but you can take a look at the work-in-progress at
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Good luck, and please contact me if you want more info or if you'd like me to clarify anything!
So, no you probably aren't the most inflexible. 
