Hi Ron,
after a short period of evaluation I stopped to work with exchange games. As soon as the cards are shown, all bots enter bets into the market, no spread between back and lay, fair value is in the middle of back and lay price.
If you enter a bet, which matches immediately, you cannot make a profit, because your bet is below fair value.
The way to success with x-feeder are unmatched value bets, patience and a trigger which avoids commission.