Although I found it necessary to self adjust my SMP, I thought it would be interesting to make a few other comments on your situation. First, the watch you have loses 6 sec/day. This is technically out of COSC specifications. It needs to be adjusted internally. Secondly, in my experience, there is nothing you can do positionally to counter a loss this much during the day. The mechanism is just too well made to accomplish this.
Furthermore, a watch with a simpler mechanism that is not adjusted for position tends to fall on one side or the other of perfect time. Movement of the watch will often increase this time discrepancy. This is like an innacurate speedometer in a car. It might be read fast by 1 mph at 30, an insignificant amount, but this would not be insignificant if the speedometer was off by 5 mph at 65. One might be able to adjust a watch that tended to run slow by advancing the mechanism. Theoretically, one might be able to advance the mechanism to gain time when it was still, but still allow the watch to lose time when it was moving. This would take some skill and considerable patience.
Now to your watch, the balance mechanism in typical chronometer watches are very stable under movement of the wearer. This is why they refer them to adjusted to position. They tend to run either fast or slow, but not both. That is to say, it is doubtful one would get a mechanism to gain the exact time it lost or vice versa by position alone (like you are proposing to do). It is possible for a technician to adjust the watch by minimizing the time descrepancy to a null point. But in practice, I can tell you it takes some persistance to get a watch that has precision within a few seconds per week. The SMP is capable of this, but Actually, I would prefer a watch that gained time as everything tends to slow down over time with frictional forces and wear.
Lastly, I wanted to point out the difference between accuracy and precision. Precision is a measure of reproducability. That is each and every time you measure something you get the same number. It is also possible to have accuracy without precision. Here you measure the number ten times but get slightly different values say 5 of the 10 times. This is accuracy without precision.
In your case, I would admonish you to have the watch adjusted. Otherwise you will probably be continually frustrated by attempts to position it one way or the other. Three seconds loss per day is a big descrepancy. The way this is done, is quite simple. But it needs the proper tools to remove the back cover of the watch and turn the adjustment ever so slightly. If you want more information on this, just ask. I have done it many times. Good luck.
