If you are not sure with charts, using percentage stops is ok.
But I would advice you to be flexible a bit...
especially when the stock fly strongly...

for example, the stock I just potong recently
got in last year...
mid Sep if I remember correctly....
as you can see....
it's way passed anyone's targets....
after the split...
one time...
I had my potong point at 2.... ( at that point... even cutting at 180, I would be damn happy)
if use percentages... it was close to 20% off the peak...

I almost... almost.... sold..... it.
no joke...
but somehow, I guess .... I was lucky also....
I did not...
When I potong ... it was 308.
and guess what....
at the start of the day....
I had ZERO potong point for the stock....
stock was trending up like mad....
getting out wasn't even on my mind........

meaning to say.... i think it's best be flexible.....

and yes there are many ways to be use the potong higher strategy.

For example again...
the almost 2 stock...

Well at this moment of time....
just assuming...
you have your FV point at 175....
stock now 193...
well.... you could even use a simple non mathematical potong formula/non charing formula...
by 'increasing' your exit point to 180....
as long as the stock is higher than 180.....
you stay put....
now if the stock moves another 5 or 10 sen higher....
you move your potong point 5 or 10 sen higher too...
to say 185.
this way... you give the stock some consoildating point but you also give increase your min profits higher....

yeah... many, many ways to do it.

Some just use charts....
as long the chart don't say sell...
they stay...
even if the price has gone crazily above the FV point.