Count DOWN or count UP in TrailingStop (FOR loop)?

[[Deleted]]

Hello,
1.
CONTEXT:
In some cases, it is much better to countdown in the FOR loop: FOR (i=total-1;0<=i;i--){...}
Like this case, (browsing all objects in a chart):
https://forum.mql4.com/9330

QUESTIONS:
In my TrailingStop function below:
- Is it better to countdown in the FOR loop ?
- In general, for orders management, is it better to COUNT DOWN or COUNT UP ?


2.
CONTEXT:
Usually, OpenTrade/CloseTrade custom functions use a WHILE loop trying 3 times to open/close a trade in case of: "TradeDispatcher: trade context is busy".

QUESTION:
In my TrailingStop function below:
- Instead of the MQ4 built in function OrderModify(), should I use a custom function ModifyMyOder() including a WHILE loop trying 3 times to modify the order?


Thanks

int TrailS(string Paire_,int ID_,double TS_) {
    if(TS_<=0){Error("TrailS:TS<=0");return(0);}
    double OOP,OSL,OTP,PtTS=Point*TS_;
    int    Ticket;
    for(int n=OrdersTotal()-1;-1<n;n--){
        if(OrderSelect(n,SELECT_BY_POS,MODE_TRADES)){
            OTK=OrderTicket    ();
            OOP=OrderOpenPrice ();
            OSL=OrderStopLoss  ();
            OTP=OrderTakeProfit();
            if(0<TS_ && Paire_==OrderSymbol() && ID_==OrderMagicNumber()){
                if(OrderType()==OP_BUY){
                 if(PtTS<Bid-OOP){if(PtTS<Bid-OSL)          {OrderModify(OTK,OOP,Bid-PtTS,OTP,0,CLR_NONE);}}
                }
                if(OrderType()==OP_SELL){
                 if(PtTS<OOP-Ask){if(PtTS<OSL-Ask || OSL==0){OrderModify(OTK,OOP,Ask+PtTS,OTP,0,CLR_NONE);}}
                }
            }
        }else{Print("ERROR: TrailS on OrderSelect "+GetLastError());}
    }
    return(0);
}