Get a data sheet from the MFG. of the injectors.
If they don't have one available, return the injectors and buy some reputable ones. It's very tough (next to impossible) for a novice to tune injector slopes. Even some pro's have difficulty. It is possible, just not easy or quick by any means.
Don't "think outside the box".
There is no box.
Do it correct, or do it twice.