Trading a DEMO account with $5000

I am trading a DEMO account with $5000. I have been fairly
successfull on choosing the right direction for the trade, but,
because I'm using money management techniques i.e. 20-25 pip stop
loss. I am getting spiked out of a lot of trades which then go
in the direction I first chose.
This occurs a lot after the market has been quiet and I have had
time to decide which direction I'm going. Then I get the dreaded spike.

Bigger stop loss bigger risk?

Any advice would be appreciated.

Regards