In my games I use a TL based scaling for the DR advantage cost. The idea is that the cost is relative to the best armor normally available as gear.
The current table normalizes the cost at TL4 at the RAW 5 pt/DR.
Code:
TL best Pt/DR cost for best
0 4 12 48
1 4 12 48
2 5 10 50
3 6 8 48
4 9 5 45
5 12 4 48
6 18 3 54
7 20 2.5 50
8 48 1 48
9 75 2/3 49.5
10 105 0.5 52.5
11 150 1/3 49.5
12 225 0.2 45
TL: is the base TL of the campaign, not the character.
best: is the best DR in a commonly available armor, this is the number that is compared to get the costs.
Pt/DR:This is how many character points one level of the DR advantage costs. Is is so that the cost for best is as close to each other while being usable numbers, so some rounding to a "nicer number"
cost for best: This is just a comparison number, the two before multiplied to check that the result is close enough.