In my cent account, i usually make use of small lots since i have the preference of position trading in volatile pairs. In a 100 dollars account, i use the lot size of 0.10 for long term trading in one pair and when i trade many pairs at a time, i use 0.03 for 3 trades. That way, i have a good margin to carry my trades. Although I have traded in many lot sizes in this trade and according to the leverage but the maximum lot size i have traded so far is 0.50 . I have not yet exceeded this lot size but i will in near future.