Hey Mike,
First off, before you do anything, when you jump the T terminal with the E1, does the idle change? This is the most important thing. If your idle does not come down and the check engine light is not blinking, then you will never be able to set the timming correctly.
Im sure its ok for you, but this has happened to me a couple of times, and if your TPS sensor is out of adjustment by just a milimeter, then the timing circuit will never be used because the ecu sees that the throttle is on. If you idle is not changing when you jump T & E1, then try to rotate your throttle position sensor countclock wise just a smudge and (if this was the problem) the idle will dive down and now the timing will be ready to be set to 5 degrees. Otherwise, you may think that the terminals are jumped, but really you are just setting the normal timing to 5 degrees and not the "base timing" which is what the computer goes into when T&E1 are jumped.
Also set your rpm to ~near~ 800rpm when you set the dizzy for 5degrees. Then when you pull the jumper on the diag. box, the idle will go up slightly and now it should be 10-14 degrees.
It sounds that you have a lack of power because you are simply setting the timing to 5degrees -- not the base timing. See what I'm saying? With the terminals jumped, the timing is lower (base mode) then normal (driving) mode with the terminals un-jumped.
Anyways, its probably really trival and sorry to say so much about this, but be sure to note that the idle changes when you jump those terminals or else its not going to be on the base mode.
Regards,
BigMike