I have been flying Ints for a long time and Game 1 was just one of those games. My opponent is a very experienced player and splitting my force would still not have helped me as he would have come at me 4 on two or 4 on one and taken out an Int for no loss.
I agree that you need more guns on target than the enemy, but B's are well designed to counter Ints in the opening moves of a match. If you can get behind them, you have them cold with an Int and that is how I usually fly. I have pulled the 4 in formation first pass trick many times and won with it many times, I pulled the same trick in games 2 and 3 for the win without losing a ship on pass 1. The following move is usually a 5K on all 4 Ints to get behind the enemy.
Also bear in mind that my enemy could not get all 4 ships firing on 1 Int, he had to fire at 3 separate ones across his 4 ships. In a 'normal' pass, we should each have lost a ship and I would have been short a stealth device or maybe 2, worth the sacrifice to get position.
Game 1 was merely one of those games where the dice say 'up yours'. My opponent and I had good laugh about it and watched the other games :-)
Game 1 was just one of those games where you chalk it up to the dice gods