kkeetr: I don't know what you mean by 'shortening some springs', unless you are talking about that dinky little spring they used with Colt Gold Cup sears (if your Springer has one), and if that is what you did it sure won't help much.
There are a number of actions you can take to smooth out the overall trigger pull of a 1911 system as well as some you can take to reduce the pull itself. In this regard you need not spend the money, and it might not be much, to get a satisfactory trigger on your 1911.
I would first stone all the hammer/sear/trigger parts, including the trigger rails - take any and all burrs or sharp edges off those parts. I would make certain the interface between the sear and the hammer is as smooth as it can be, without burrs or sharp edges. Also, if you have one of those dinky half sears like they use (d?) in the Gold Cup, get rid of it for a set of Chip McCormick parts, they work better.
If you have an aluminum trigger, buy a Chip McCormick trigger and stone or file or sand it smooth top and bottom and make certain there are no sharp edges on the trigger bars. You may also wish to contour the trigger to your grip/finger - most of these things are square across the front and have grooves in them for a positive finger grip (er whatever you want to call it) - I ground those off mine, and ground the edges down so it is smooth all around - it feels better to me.
Last, I would get a couple of mainsprings (the 3 pronged flat springs that sit behind the grip safety. The center spring bar puts tension on the trigger and just by relieving some of that pressure (bend the spring out a bit until the trigger pull lightens up) you can significantly lighten up a trigger pull.
This is what I usually do with my 1911s - I know there are a bunch of guys on this forum who have their own tricks and techniques and maybe they will kick in with some better advice. HTH. Mikey.