Let's use Savitsky's research that you referenced and your 8 meter race boat that you have optimized for a SLR of 1.3 (3.3meters/s (6.4 knots) / √ length (26 feet)) and compare its hull features to Savitsky's descriptions.

Savitsky in figure 4 shows that the difference in resistance between a displacement hull and a semi-displacement hull at a SLR of 1.3 is ZERO. The cost in increasing the speed to an SLR of 1.8 (6.5 knots to 9 knots) for a semi- displacement hull is double the resistance and off the chart (literally) for a displacement hull.

The target speed for your race boat seems to be as fast and efficient as possible : ) An SLR of 1 is the most efficient point (5.5 knots).

Your design seems to follow the Semi-Displacement hull the closest. The exceptions are "straight buttock lines in the afterbody with a slight steady rise aft." Your design is concave there which increases squatting and is similar to a displacement hull shape.

"Round bilges along the entire hull -although some designers may prefer a combination of sharp chine aft with round chine forward or vice-versa."  Your design has sharp chines fore and aft which increases separation and drag.  I happen to think that his description here is very poor though.

To summarize let me again quote Savitsky "In summary, the semi-displacement hull form is recommended for operation in the region of SLR between approximately 1.3 and 3.0. For higher speed the hard chine planing hull form is required.

 

Obviously your boat is not designed to exceed a SLR of 3 (16.5 knots) so a hard chine is detrimental to its performance at speeds less than 16.5 knots. Your boats performance would be improved by using a standard semi-displacement hull.

Talador