Stop looking for the spot and start looking for the shot. Here is a place to start. The break is a shot like any other. The primary concern is accuracy and control. Put an object ball on line even with the spot to the right or left. Put the cue ball in the kitchen lined up for a straight in shot on the object ball you just placed. What you are going for is a stun through shot. You want the cue ball to roll through a couple of turns down the line and die. The cue ball should not step off to the side after impact. It should proceed down the same line the object ball took to the pocket.
The maximum speed you can make that shot is your maximum baseline break speed. If you go above that speed you sacrifice accuracy. How much does it fall off? This is information you need to know. Know what the trade offs are for your stroke. Ignore how the professionals break. You do not have their stroke and they do not have yours.
Different tables play different speeds. The same table will play a different speed on a different day. Respond to what the table is telling you and make adjustments. Develop more than one break shot. Are you coming off the rack to the side rail or crossing over to the other side? Dying in the middle or pulling back off the rack? Where do you want the one ball to go? Hit the rail above or below the side pocket? Where is the two ball? Where is the two ball going to go based on it's current position in the rack? Do you want the one ball on the same side of the table as the two or the opposite side?
These are all shots that must be delivered with power, accuracy and control. If you do not have a consistent shot to measure the table with, how will you be able to adapt? If you are just up there gripping and ripping it looking for the magic spot, good luck. You will still be looking for consistency after I am long gone.