alts pretty much always correct higher than btc, about 10-40% more. Alts also only gain over BTC when it is trading sideways in an upward impulse wave. Ss BTC dominance should go higher as it corrects downward, but should lose dominance once the correction is over and sideways trading begins. When the whole market goes bullish again, it is first bitcoin that increases its dominance and then the "alt market" follows
Anyway, my 2 cents :)