Are tick data important and necessary to large time-frame strategy in backtesting?

Hello, I have developed an EA to trade in 4 hour time-frame. Its totally NOT scalping strategy.
When I use tick data downloaded from metaquotes in mt4 to undergo a backtest, the results suck.
but when only use the H4 with H1 data from the brokers in a backtest, it works well.

SO, should I trust if that EA works well?