Limitup, patience is not just a virtue but a required personality trait in trading anything, however using an LRR of 20% one one and 10% on the other is likely going to blow out the account sooner or later. I have run back tests with everything from 10% all the way to 25% LRR and my best and most stable results are still in the 5-9% range. Nothing risked is nothing gained but abnormal risk is just asking for a blow out. Also keep in mind you are missing out on potential profit by only running two pairs. If you are worried about the spreads, look at the spread their live $370 account is trading on. GBPCHF is 12 pips on IBFX live accounts yet they still trade it and it is usually profitable.
Divesersification is as important in forex trading as it is in the stock market although there are certain pairs where profits can be gained routinely (EURUSD).
Check out this thread and look at the excel sheet I have posted with multipair back test data.
http://www.forexautopilotforum.com/showthread.php?t=502