Cloth conditions will affect the consistency of your theory. For example, if it's raining outside and the cloth is damp, your normal stop shot tip placement might not be affected because although the cb may slide more on the damp cloth, it won't change the result of your stop shot. However, dropping down a tip to get one diamond draw on a damp table probably won't be enough. In that case you would either need to increase speed, which could endanger the ball pocketing aspect, or place the tip lower than you calculated --- and often times, even both.
The opposite holds true for a newer cloth. Although your normal tip placement may be adequate for a stop shot, you may find on a newer cloth that the cb will draw back farther than you expect.
There are other cloth conditions that affect draw shots as well, like cloth that became loose over time, or not pulled tight enough at installation. Worn cloth, nappy cloth, the list goes on....
If you can find a way to add and subtract based on cloth conditions it may work, but nothing beats feel in this type of situation. Learning to develop your feel for shots in varying conditions is really the more reliable way to go.