For RLA, the first multiplier is 2x. Subsequent RLAs add 0.5, 0.25, 0.25 to the multiplier. But expressed as a fraction of the initial multiplier, this is 0.25, 0.125, 0.125. Scale array has been updated to reflect this. This means the "-1" in the calculation is no longer required, and that boost is correctly calculated when baseMultiplier is anything other than 2 (eg VRLA, when it is 7).
If there aren't any Link Amps, the multiplier is 1x.