if it was my wires, id take em off try to un crimp them, pull em apart and re do em right. they dont need to be perfectly round, just need to be able to get the solder in and then the wire pushed back in there.
put your shrink tube on before the end gets soldered back on, or it may not fit over the lug. keep it far from the heat too. they shrink easy then get stuck on the wire and its no longer usable.