I'm certainly not an expert; but I have made a few bows. If you didn't add any backing to the bow it will loose DW. You might try leaving it strung up for a few days and shooting it without overexerting your self everyday, just to give the bow time to acclimate to the new tension under that wood...and if you had a lot of moisture content in the wood it will lose some of the tension if you leave it strung up a few days.

How much is too much, can you draw it back to enough that you can sight down the arrow? If it's that hard time to get out the draw knife.

It's just my opinion, because the first few bows I made were just about right and before long they lost DW. I soon then started backing them with bamboo or fiberglass.