My toilet has a "weak flush" It will seem to fill, but when you go to use it again, there is not a strong enough "current" to flush away the waste products. I have tried to shorten the chain on the inside of the tank to help it, but that does not seem to work. Any suggestions

Playing with the flapper chain won't give you a better flush. Make sure the tank level is 1/2" under the top of white overflow tube. Let me help with that lazy flush of yours.
I have one that most repair plumbers miss.. Look down at the bottom of the bowl. If there is a small hole, then that is a jet that starts the syphon action. If it's clogged the water will just swirl around and slowly go down leaving solids behind. Take your finger,(UGH!!) and run it around the inside of the opening. Over the years minerals build up and cut down on the syphon (flush) action. If it is rough or you feel build up, take a table knife and put a bend in it to get around the curve in the bowl and chip and scrap it clear. Next take a coathanger and clear out the holes around the rim. They start the swirling action. And last, check the water level in the tank. It should be 1/2" below the top of the over flow tube. And speaking of the overflow tube, Make sure the small 1/8" tube from the ballcock to the white overflow tube is connected so it discharges in it and that it's flowing when the ballcock fills. This is what raises the water level in the bowl. For a good solid flush they all have to work together. Hope this helps and thank you for rating my reply.. Tom

Hi,

You might want to look into the toilet jets, because it could be clogged with lime build ups , etc. And how old is your toilet? Try to looking into it. Thanks