Just to make sure - you are using 4x ratio for the vs LTC calculation, right?
Correct. Current profit multipliers are 0.47 for Scrypt-N, and 4.0 for X11. The raw numbers in the stats table are not multiplied (BTC, Hashrate, BTC/1MH/day), only the "vsLTC" numbers are scaled by the profit multipliers.
Any chance you can give us a stats_api?algo=all option to retrieve rate tables for all algorithms in only one call?