Let me post 2 examples
1. (High – (high * 0.01)) for short
Suppose NF high 9000 then
{9000 - (9000 x 0.01)}
= 9000 - 90
= 8910
So you think one should wait till 8910 for a short for a scalp.
2. (low + (low * 0.01))
Suppose NF low is 8900 then
{8900 + (8900 x 0.01)}
= 8900 + 89
= 8989
So you want to say that one should wait till 8989 to go long for a scalp
IMO, even stocks in the range of 200 - 500 may not work (leave aside higher price stocks), unless there is very high volatility and stocks below 200 wont work because of volatility and applicable cost and taxes. I do not understand how these formulas are working for you and for what stocks.
If I am wrong (may be I didnt understand your scalping strategy), then please explain with examples.