Shedding the last 10 pounds

So I've had some amazing success shedding weight using MFP - about 46lbs now! Everything has been going great, but now I'm shifting gears just a little bit.

In addition to wanting to shed the last, terrible 10lbs (which has been difficult!), I am trying to maintain/build muscle mass. I'm at 140 now and am trying to get to 130 (at 5'6). I'm a long distance endurance cyclist (in the summer, I regularly do 100+ miles a day every weekend). I'm preparing for a strenuous season filled with new goals. I'm looking to do 180 in a day, 250 in a day (and in less than 18 hours), and be able to qualify for Last Chance (750 miles over 4 days).

I've found that upping my protein has helped me increase my power and recover quicker; however, since I've started buckling down on my calories in the past week, I've noticed my energy levels drop in the morning when I do training sessions on my bike. I can still put out some pretty good power, but it seems more exhausting than when I was just maintaining.

I've opened my diary for scrutiny. It's probably pretty incomplete for anything older than 3 days (as I mentioned, I'm trying to crawl back on the wagon of logging everything).

What I'm really looking for, in a nutshell, is the best way to slim down, lose the last 10lbs, but still be able to build/maintain lean muscle for my cycling activities.

Thanks!