To change or not to change a cover

I am not sure if this is the best place to put this but here goes I have the first book in a historical romance out now which I have been promoting for almost two months. I have decided that the cover of the book just isn't exactly what I want and it doesn't really feel like a historical cover to me so I would like to switch it out for another that I just finished. My question is, is this going to affect the promotion I have already done and when is the best time to change the cover? This is the first in a series and the second will be coming out in the next month or two so I could wait and switch it then but I have several reviews coming out in the next few weeks so perhaps before those are released I should change it?? I am really torn and I would love any advice my lovely AW friends could offer.

It is only for sale online and it really won't cost anything other than the time it takes to change it. I am afraid that I am losing sales because it is not really clear based only on the cover that it is a historical. When I first released it I wanted to play up the mystery/adventure part of the book but now I am wondering if I need to focus more on this historical/romance aspect. I think I have decided to go ahead and change it because it is only the first book in a series of 5 so if there were a time to change it it would be now I suppose. I am just really freaked because I do not want to do damage to the tiny audience I have already established.

I am only selling it for EReader. I have been marketing all along as a historical romance so I think I should be ok. As you will see in my sig I have begun the changing process. I think all I have left is to change the video and re-upload it to youtube.

Yes the one with the gold is the new one and the purple with the people running is the old. I haven't had a chance to change everything over. Every time I think I have gotten everything I come across something else.