Most all Colt replicas "like the orriginals" shoot a little high at 25 yards & that part is easy to fix but a few things need to be done first.
When you can, get a decent supply of .375 or .380 ball, caps, powder, cleaning gear, small fine triangle file & paitience.
When you go the range try to use a bench rest that you can place both of your hands around your weapon for as steady of a shot as you can, & place a 2'X2' target board "since you were able to hit close to POA you will not need a 4'X4' board.
When at the shooting range, try to be as consistent as possible in your shots because what you want is the best group that you can achieve at 25 yards that you can make.
Once you have made that group & am sattisfied that it is the best that you can make "from the bench" then you need to look at the windage, if it is only 1-3 inches to the left then hold off on this adjustment & go for the elevation by filing the V grove that is on the nose of the hammer a few strokes at a time & then a few strokes across the top of the hammer nose.
In effect what you want is to bring the V grove slightly deeper into the hammer tip & then using the file to bring the top of the V grove down just a bit to bring the high shots down to the correct POA that you want, but don't file too much!
Just a few strokes at a time will make a difference.
Once you have the pistol shooting a group where you want it to hit "elevation wise" & if it is still shooting slightly left, & since this is an open top pistol the only option is to have your front sight be more to the right of the V grove than center.
First try to shoot it using the sight as it is but have the front sight closer to the right than center.
If this brings it closer to the POA that you want but is still slightly left there is 2 options.
(1) aim slightly right of the target when you are shooting.
(2) file just a little at a time the right side of the V grove to make the front sight more to the right than center.
With one of my 58' Remmies I had to adjust my front sight for elevation & widen the V grove just a little to get her to shoot POA at 25 yards.
I hope this helps.