day to day goals and risk in general

hey forum, this is probably a n00bs question. however it give me a great level of "wondering"

i have set myself a day-to-day Goal of 5% .. (where this is just somethings for myself to keep the pace .. i not really force it to happen)

however, in contrast to the 2% Risk rule .. this is somethings actually pretty easy to accomplish.

my recent strategy tests (just trying it out for 2 weeks now (still on demo) reveals that i do hit the 5% goal pretty easy.
i start the day before Sidney opens .. place buy stops on the idleing prices in both directions .. and pick it up from there.
once the trend is build .. i keep with it, and in most days where i have been consistent and did not fuck with my own strategy and/or got emotionally involved ..

i did hit the imaginary 5% goal pretty easy (in most cases in less then 3 hours on the 3 - 8 minutes Charts (less choppy = lower timeframe, its part of my strategy)

so well i know this is all very theoretical with just 2 weeks of practice .. but is there some truth to it in the long run.
AND most importantly if so, why do peoples take on much larger swings (larger timeframes) .. which basically reduces the lot size because of risk management due to the higher swings happens over hours, days weeks ..

iam about 75% sure i do miss somethings .. but i can't get to it ... so maybe someone can hint me in the right direction.

just to clarify what i meant

if i make the decition to get into a trade i messure the required Stoploss (in this example its 22 pips)

so Hit F9 and type -22 in the Stoploss field
then increase/decrease the lot size until the percentage is close to my Risk (2% in this case)


repeat until the 5% goal is reached => go to the beach
or if max Drawdown of 7% and/or get emotional => shutdown -h now => go to the beach (tomorrow is another day)

so the outcome will be no different if there are 200USD or 500.000USD on the Trading Account.. its just Mathematics.
again i'm sure missing somethings