You could and I have done this. The thrustline change has other effects like it creates even more up elevator trim for flying level. So now the model pulls to the canopy even more on a downline.

The best results I have found is the Pinancle flies better with the CG adjusted to correct the pull on the upline. When this is done model is still balanced very forward from where most pilots fly their models today. I just think the stock CG of 175mm is a touch forward and the model carries a little up trim off the boards. All the Oxai's I have flown have had this. Slide the CG back to about 180mm and it all goes away and the models still track excellent. There is a needs for a very slight down elevator mix on the downline and its done. As you give more down thrust to the model you are causing a force that must be overcome in the tail. When the force at the nose is removed now the tail is still acting. Moving the CG 1/4" or 5mm does the same as the downthrust for the uplines and also reduces the pull the canopy on the downlines. I have rarely seen models that don't have a slight slight pull to the canopy in a power off dive. I have been able to mitigate it or reduce it signifigantly but I don't think I have been able to trim the model to track properly based on CG and still have the CG aft enough to remove the pull to the canopy on a downline.

all changes you make in trim are a compromise. The Deisel and the Pinnacle are very similar and in fact the wings are almost the same. The fuse shape is a little different but the moments and important stuff are so much alike.

If I had a deisel I would try sliding the CG back to remove pitch tot he canopy in the upline and help reduce up elevator trim. I think the Pinnacle has some improvements like less pitch coupling but the Deisel can be mixed out and if you do the mix properly it won't affect the other attributes. Mixing is not something to afraid of its just another tool to make the model do what you want it to do. Again its a compromise. The big 40% models tend to have large amounts of mixing like on the order of 10-20% sometimes and they still fly very well.

Troy Newman