That 55 turn crawler motor will have oodles of low end torque, just right for a 4 blade brass prop. The 4 blade brass prop also explains your problems previously with 540/600 motors.
There is much advice above, most of it vague unfortunately. Just using a '540' wont guarantee a good performance, just using a 5 pole version also no guarantee. What you need is good, hard advice, based on experience. Netleyneds advice regarding the MFA RE540/1 is spot on. This motor is a fairly lightly wound, medium power motor, ideal for scale use, up to a 40mm prop. MFA also produce something called a RE540LN, which, just to add to the confusion, has a can length more like a '550' type motor, it is also a 5 pole motor, which is lighter wound than their standard 540/1. This is slower and has greater torque, so is once again good for slightly bigger props, I would say up to 45mm at a push.
The new crawler motors coming onto the market now are brilliant direct drive scale motors, the more windings the more torque. I have a 70 turn motor, and the torque is incredible. I think it could turn over a 50mm prop with ease.
As a simple rule of thumb, the more windings a motor has, the more grunt it has and the less it will be loaded down with the wrong prop. Too much load, too high current. The problem is many motors dont offer this advice. I often resort to looking into the cooling hole of the motor. If it has many thin windings it will be slower but more suitable at lower speeds. If it has less windings that are thicker, it will be faster, more ampy and run hotter.
Different motors for different jobs..