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Is your 13 only kept on a trailer? Or is the boat kept in the water at a slip or mooring?
If only kept on a trailer, the the static trim of the boat will rarely matter.
However, if kept in the water, the 13's with 40 E-TEC's, because if the excess weight, have a substantial portion of the lower unit submerged in the water even when tilted all the way up........very UNdesirable.
One 13 in particular that I need to pass by on my way to open water had a fouled prop, and significant green growth fouling the raw water cooling intakes. A mess. (If your boat is to be used daily, then perhaps, you could keep up with the preventative maintenance)
We consistently used our 13 Super Sport with the 30 E-TEC as a taxi to a small island to enjoy the beach. Many times with 4+ full size adults and gear, our guests questioned if we would get on plane. Let me tell you about the astonished looks on their faces when that 30 E-TEC lifted that 13 on plane without a problem and zipped over to the beach.

I too struggled with this decision when re-powered. I had a Johnson 2000 40hp 2-stroke. I resigned myself to the fact that I was "settling" for a "little 30". But I must say, I never looked back because of the great performance with the 30.
One extra point. I did install a Sting-Ray Jr. Hydrofoil (like doelfin) on the 2000 Johnson, AND the 30 E-TEC. Many times in choppy water there was a true benefit to be able to plane, but at the slowest speed possible, for comfort and dryness. The hydrofoil accsentuated the ability of the trim function to allow the 13 to plane at a lower speed without the aft end squatting while underway.