Zeb, no worries , glad to help. The tabs are very effective at raising the stern/lowering the bow. You now have the the long skinny (12x20?) tabs , correct? Same as my original mentioned above , correct?
What is your speed at 1/2 throttle ? What prop? I ask because I have my boat propped down quite a bit to stay on plane at a lower speed and my 1/2 throttle is most likely slower than yours. With the deep v belly on the 2520xld I believe bow rise at lower speeds is really a function of the stern being low and as speed rises the stern rises , bow comes down . On my boat the old tabs would do the job fully deflected once I propped down so the motor had the torque to keep the boat on plane at say 20mph , but the drag from the old tabs all the way down was so much I could not achieve the low planning speed until I propped down w/ 4blade 13" pitch. For my area slower planning speed in the short duration wind swells is a lot more important than going 40 mph, we just cant go fast very often.
So with the prop change ,I gave up speed and a bit of fuel mileage for more bottom end power to be able to stay on plane slower and go up and down swells and through the wind chop without ever having to touch the throttle , again with the old tabs all the way down this was a effective combo.
My hope with the big new tabs was that I could achieve the same low speed plane w/ less drag and possibly be able to get a bit better fuel mileage, maybe w/ a bit more prop pitch.
So the verdict is that the tabs helped. I am able to find the happy spot with less deflection . But, here is the thing , I fished many days on a older model 25 deep v parker with a I/O diesel and those boats were just balanced better , and MUCH lighter (hard to get real figures but at least 1000lbs lighter) The old boat would stay on plane at 16-18 and go through anything with the bow down comfortably . I had hoped to get my boat closer to that type of performance but I have now realized there is no fixing a over weight ,stern heavy boat.
My guess is the bigger tabs would be a must on the twin powered 25xld w/ just that much more weight back there. My boat is pretty stripped down I have no added weight behind the cabin what so ever, just to try and help the stern heavy condition. When needed, 200 gallons of fuel , in the tank to to far aft IMO, kills this set up we have.
If you tell more about your set up I can tell you weather or not I would do the tab change again.
Hope this helps!
