Taking emotional trades has NOTHING to do with trade size. It's all about how you perceive the market. The larger trade size I do the less emotional I become. This is purely a psychological barrier. Ultimately you either trust yourself to trade well or you don't. I don't trust myself any less just because I am trading more contracts. The money is irrelevant - it is all about what the market is telling me.
Greed can also be a force of good. Wednesday morning I woke up and made 19 pips. The next trade was even better and so I traded larger size. I made 45 pips. I let the market tell me how to trade - not my ego. What I made on the last trade, last week, etc. has no bearing on how I take the next trade. Only the market tells me how to trade.
Winning traders know how the make the MOST of a winning trade, whether it be for 5 pips or 500 pips. Losing traders hold losing trades to prevent a loss. Thus they make their losing trades far outweigh their winning trades. Ironically their fear of losing only perpetuates more losing. As a winning trader I do the opposite, by holding winning trades until the market tells me to exit, and by exiting losing trades when the market tells me I am on the wrong side of the trade.
Those are the ingredients of a winning trader. Not indicators, but emotions. Observe the market's emotions, observe your own emotions. Trade in the direction of market momentum based on the emotions of the markets.
Eudaimonia (pron.: you-die-moan-e-a) (Greek: εὐδαιμονία) is a classical Greek word commonly translated as 'happiness'. The less subjective "human flourishing" is often preferred as a translation.