jForex is a platform of DukasCopy. It is able to export good quality historical data files including tick data.
Once the tick data are converted from FSB, you can allow tick backtesting from the Scanner tool. FSB will use them only to calculate the data route inside the bar. The indicators and signals will be calculated by using the corresponding bar data as before. The tick backtester will replace bar interpolating where tick data are available. This will reduce the number of ambiguous bars during the test.