Quick question about set-up.

[JoeBro44]

Tried the TXP tonight for the first time. I only have a handheld GPS so no speeds yet (I need two hands to drive! ). TREMEMDOUS hole shot, I mean FAAAAAAAAAAST! Great handling, seems quick but no way to tell without GPS yet. 2 1/2" below pad. 24 PSI water pressure. 5600 - 5700 RPM's. By myself with 3/4 tanks of fuel and 1.69 tons of tackle. Now here's the question. At 3/4 trim my rooster tail is just lower than the top of the engine cowl. At full trim (or damned close to it) there's no rooster tail at all. I was always told that as a rule of thumb the rooster tail should be about even with the top of the cowl. Why would it disappear at full trim? I figured at full trim it would be higher than 3/4 trim. Gotta get a GPS on it to dial it in but until then this has me wondering. Probably gonna raise it another 1/4" since I still have tons of water pressure and RPM's available. But was hoping someone would be able to tell me what's going on before I do that. Also, not a rooster tail freak or anything, I understand that too high a rooster tail means you're wasting HP but I've alway gone by that "High as your Cowl" theory.

[HondaRay]

As you add trim, the bow of the boat lifts...thus the propeller moves deeper into the water therefore less rooster tail. When the bow has reached max lift...trimming the motor will cause a larger (higher) spray.
Typically raise the engine only if the bow is still lifting and you have ADEQUATE WATER PRESSURE.