I am thinking about putting another 10BTC on XMR yet i also want to wait for a nice big dump....What do?

The nice big dumps already happened, when we went to 0.001.
Given decreasing emission and increasing awareness/usability/demand, we may not revisit those lows.
If you could go back to 2011, would you really care about paying $1.50 vs $1 for Bitcoins?
Don't try to pick up pennies in front of bulldozers, unless you are a pro day trader watching the markets like a hawk.