Welcome
Two months is not too long! I’ve had it take about 5 months to see shy bunnies start coming out of their shell, and some people report a year. It sounds like they are happy, and are still just settling in. It sounds like you are doing the right things, but bunnies often just take time and patience. It is worth it though
You have had some really positive experiences with them, so it sounds like you are on the right track!
I’ve found with shy bunnies playing hard to get works wonders. So basically kind of ignore them. If they come up to you, don’t try to pet them right away. Each day they are learning more and more that you will not hurt them, and that your place is safe.
Bunnies also seem to make changes in jumps (no pun intended). So one day, they decide you are to be trusted, and then there is a big improvement.
If they tend to startle when you enter the room, it might help to say something to them when you come in, so they know you are coming, but then don’t immediately go to them, unless you have a treat in hand. 
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.