I'll try one more time... the SE warp drives operates by getting your velocity through real space up to about 10 km/sec and heading directly towards your target. It does this by showing you a delta-v — change in velocity — bug on your screen. It is saying "fly in this direction until the delta-v shown drops to zero". That will have changed your direction and speed through real space to put your hyperspace bug on your target.
Now you can rotate towards your target (or, in reality, the hyperspace vector), and engage the warp drive. If you want, you can by all means fire up the main engines again. You will build up speed, and that will be translated into greater warp speed. But the basic autopilot was not made to take 1,400 km/sec speeds into account. It will try and bleed that off, and it takes time to do that.
Answer me this: You are travelling at 10 km/sec and you need to adjust your course 20 degrees to starboard. Another ship is travelling at 1,400 km/sec and needs to adjust its course by 20 degrees. They both have the same mass and engines capable of 12.2g of thrust. Which one do you think will achieve the course correction first?
Also: Your target is 6.7 million light-years away, but your velocity vector is off by one-half a degree. Without any course corrections, by how much will you miss your target?
Ah okay so it's silly for me to keep going in that direction after the bug has been neutralized to zero even though if I keep it up the crosshairs of the velocity vector and boost factor line up. So I wasted 2 extra hours there and then another 4 hours after selecting Hyperjump to cancel out the positive bug that built up from waiting that extra 2 hours. That explains why the journey's length is variable.....13 hours + 6 hours = 19 hours which explains why it was taking longer when I unnecessarily ran the main engines at full blast in the direction of a bug that no longer exists. So from now on I'll turn on Hyperjump as soon as the negative velocity vector bug is gone, regardless of where the markers are. The 1,400 km/sec was only happening because I kept flying in that direction even after the negative velocity vector bug was gone, for an extra 2 hours, to get the green and pink markers right on top of each other. Which now seems completely unnecessary lol. The 'fly in this direction to neutralize the delta v bug' I can do that at Main engines 100 though right because the higher the engine thrust the faster the bug will be corrected? Just dont stay in that direction any longer than it takes for the negative velocity vector bug to go away and then select Hyperjump right away?
One thing though, I don't need to select rotate to target correct? I can just select Hyperjump and that will both sync velocity and rotate to target? Because I see it automatically calls both functions.
lol that first question is easy, the first ship will achieve the directional change 140x sooner because its velocity is 140x slower.
I'm actually not sure about the answer to the other question but let's try some deductive reasoning. The Andromeda Galaxy is 2.54 million light years away and about 3 degrees wide. A galaxy that is 6.7 million light years away is 2.64x further away than M31 but since the course correction would amount to half a degree, it should be one sixth the width of M31 at its distance. So 220,000 ly divided by 6 which is 36,667 Ly but then you have to multiply that by 2.64x to see how far off you'd be at 6.7 million Ly without applying the course correction and it turns into a whopping 96,800 Ly! Did I get that right?