I've read a lot of threads no one seems to has this problem that I could fine.

Using the paddle shifters and holding in any single gear and going to wide open throttle the transmission revs up 3000 RPMs it takes a few seconds but then it seems to catch up with itself and has good clamping force in every gear from that point on as long as you are still engaging wide-open throttle it will continue perfectly. If the clutches were truly bad they should not be able to hold at any point however with several modifications I can hold at wide open throttle at well over 100 miles an hour going uphill in fourth fifth and sixth with no slipping.

As I said the slipping mainly occurs when you first start out it takes a delicate touch to get the car up to speed it is almost as if the transmission at lower RPMs is not getting enough pressure to clamp the clutch pack together but finds the pressure it needs at higher RPMs the transmission only has 11,000 miles.

I am also running the ffl2 trans oil.? Maybe?

 

so... is it 'lagging' getting to 3K RPMs?

That is not clutch/slipping.

 

I'm not sure if I'm understanding exactly what the problem is.
What I would say is only use OEM or SSP pro gold TC-SST fluid. Change the filter every time you change the fluid, or buy a reusable metal filter and clean it at every fluid change.

 

 

THIS is your problem. The fastest way to wreck a clutch pack on a new trans is to put Pentosyn FFL in it.

The SST doe NOT like this fluid. If it has been in the trans less than 3500 miles or so, then it may recover itself after going back to OE fluid in a few thousand miles. If it has been in the trans longer, you will need to replace the clutch pack.

I have posted this a number of times in many locations. It's a $10000 transmission. Trying to save money on service by using non OE fluid is a very expensive mistake.