The studies about red lights were interesting. I am in southern California and was able to breed all year round. We do get cold temps here, but the reason I was able to keep my does receptive was because I used regular lights in my barn all year to keep the "daylight" long. I bred continuously year round. We also used heat lamps when necessary but here a regular 100 watt bulb sufficed for warmth. My 4-H kids would only breed for the fair and then couldn't figure out why their does would not breed the following year. Giving them a "vacation" is bad for their breeding cycle, In the wild rabbits breed constantly depending on season, and are most fertile a week after giving birth. Consequently in the wild the doe will kindle again 5 weeks after a litter and abandon the month old kits.
That said, if you want to breed year round, you have to mimic not the warmth but the daylight hours. I did the same thing to keep my chickens laying all year. It sounds like the increase in light hours did the trick on the does. The younger one is ready to breed too since her humping the buck is a sign of readiness in an inexperienced doe. If you put her in a cage next to the buck for a couple days then put her back in with him she should breed. I have also switched cages - doe with buck - and it works. If she still tries to hump him, hold her still by the head so the buck can mount her and she should rise for him. Rabbit foreplay can be exhausting for the male LOL and can out off a young buck so I used to put my first time does with experienced bucks and use young first time bucks on my experienced "welcoming" does. It makes for a good experience all around.
Another tip if you have a doe that doesn't want to breed is to put her in a carrier and take her for a ride in the car, then breed her. We used this all the time when we bred Champagnes which is a breed notorious for not wanting to rise for the buck.
If you eventually have a doe that absolutely will not breed, think peas, carrots and potatoes! Good Luck!