Bennet Electronic Trim Tabs Sizing questions for re-fit.

[biggarfish]

I'll be swapping out the hydraulic Bennet Trim Tab system on my 1988 Grady Gulfstream for a new Electronic Bennet system over the winter. My question is: Based on the fact I have a customized pod that mounts the twin 150's and 15 hp Pro Kicker out a little farther than a stock configuration (has a flotation chamber midship on the pod) should I gravitate toward the larger 24" x 12" trim tabs or will the 24" x 9" do the trick just as well?

 

[seasick]

What size are the existing tabs? If you were satisfied with their performance, I guess that size is appropriate, What size does Bennet recommend?
The 24 by 12 sounds big to me for a 23 foot hull but on the other hand, many feel that bigger is better.