Cream Ale is a little lower in volume than planned...

..So... After getting input from fellow brewers and from brewing linx on the net I have decided to make an addition of 1/2 gallon of water before I rack to the secondary, placing the boiled and cooled water into the carboy first. To minimize aeration I'll put the water into the bottling bucket and attach a hose to the cock, lower the hose to the bottom of the carboy, and open the cock. THEN: I will rack to the secondary. What about the OG? That was 1.077 at 4.5 gallons. Recalculating it thusly:
SG=Starting Gravity = 1.077 = 77 Gravity Points
V1(ferm) = Volume in Fermenter = 4.5
OG = 1.055 (intended OG)= 55 Gravity Points

To determine the volume to add to achieve the intended gravity of your wort in the secondary fermenter, divide the SG points by the OG points and mulitply by the V1 volume.
SG/OG x V1 = 77/55 x 4.5 gallons = 6.3 gallons 6.3-4.5= 1.8 gallons of water to get 1.055 gravity.

I want 5 gallons rather than 6.3 gallons which is more volume than I have carboy space for.

To determine a gravity for a specific volume:
V2=5 gallons.
OG = (((V2 / V1) x SG)*1000) + 1 = 69.3 = 1.069 OG.

I think that I'll use a 6 gallon carboy to secondary in and will have a 1.057 OG.