I think LiPo break in was more important with < 25C packs... I think the norm these days are 100C packs and the amount of current our cars pull are fairly insignificant in terms of the 7C limit.

5Ah x 7C = 35A

Pretty sure that most 1/10 Mod 540 motors only pull around 20A - 30A max

If you're running stock, then the pack won't even break a sweat, ha!