Everyone can see the NCHSAA RPI here:
NCHSAA RPI Rankings
I'm using 4A West as an example. I have done the RPI with 60/30/10 and 50/40/10.
Results of 60% WP/30% OWP/10% OOWP
1 Grimsley .83772
2 East Forsyth .81517
3 Watauga .78149
4 Mooresville .76449
5 AC Reynolds .75425
6 Olympic .74849
7 Weddington .74723
8 Hough .72642
9 Butler .72615
10 Independence .71576
11 Mallard Creek .71221
12 Chambers .70622
13 Asheville .69996
14 Cox Mill .69995
15 Mount Tabor .68387
16 Reagan .68307
17 Charlotte Catholic .67903
18 NW Guilford .67562
19 Ardrey Kell .67028
20 Lake Norman .65185
21 TC Roberson .62262
22 SE Guilford .61259
23 Porter Ridge .59626
24 Hickory Ridge .59389
25 Page .57149
26 Marvin Ridge .54423
27 AL Brown .54019
28 SW Guilford .52240
29 North Meck .52058
30 McDowell .51096
31 Providence .49341
32 West Forsyth .49103
33 Alexander Central .48927
34 South Iredell .47546
35 South Caldwell .46898
36 Northern Guilford .46616
37 South Meck .44874
38 Davie .42304
39 Myers Park .42127
40 Sun Valley .41434
41 Glenn .41169
42 Cuthbertson .37218
43 Harding .36875
44 East Meck .31807
45 RJ Reynolds .31673
46 Hopewell .30619
47 Ragsdale .30375
48 Rocky River .29775
49 Berry .28010
50 West Cabarrus .26795
51 Palisades .23459
52 Piedmont .22435
53 Western Guilford .22105
54 Garinger .18865
55 Parkland .16599