In fact, many of my lifts remained stagnant (some decreased) during the time I was strictly on the diet. It didn't cause me any negative effects besides the performance in the gym and the feeling that I was in dietary jail, per se, but I saw no tangible benefits from a personal perspective. Getting back onto the StackingPlates™ diet plan based upon discretionary calorie allowance (DCA) after those ~18 months was liberating as both strength increases and sanity returned with each pizza and bowl of ice cream I ate.
On a side note, when will my insidious weight gain start? I'm getting very anxious...
Now, as much as the hardcore believers want to believe to the contrary, Paleo™ is just a tool and is no better or worse than a plethora of other dietary and lifestyle tools out there (this does not include folks with food disorders who should not be relevant to the discussion that follows). 
In fact, those who are gung ho, absolutely positive, that it is superior from a health perspective may want to rethink this belief based on empirical and scientific analysis on the topic. Bray et al have already dispelled the notion that "clean eating" exists by comparing hormonal differences between groups eating fast food and food thought traditionally as "clean" . The study limitation is that it is just a snapshot and not a long term study however it does support the notion that a diet predominantly filled with whole, minimally processed food while hitting caloric/micro/macro sufficiency will not be adversely effected by eating what Paleo clan-folk refer to as "junk" from time to time.
Empirically, all we have to do is look at the healthiest societies in the world and use them as a template to extrapolate dietary data from. Many of the longest living societies in the world  such as the famous Blue Zone societies eat CHO filled diets with many foods Paleo™ dieters would run away from. One such example , the Okinawans, eat ~800-2500g of grains per day yet live the longest. Far from conclusive evidence that supports Paleo™ being the "healthiest" diet in existence. More like one of many potential ends to a mean.
1. "Comparison of Weight-Loss Diets with Different Compositions of Fat, Protein, and Carbohydrates" N Engl J Med 2009; 360:859-873February 26, 2009 (MMS: Error)
2. Bray GA et. al. Hormonal Responses to a Fast-Food Meal Compared with Nutritionally Comparable Meals of Different Composition. Ann Nutr Metab. 2007 May 29;51(2):163-171
3. Buettner D. The Blue Zone: Lessons for Living Longer From the People Who’ve Lived the Longest. Washington, DC: National Geographic Society; 2008.
4. Cockerham, W. C. and Yamori, Y. (2001), Okinawa: an exception to the social gradient of life expectancy in Japan. Asia Pacific Journal of Clinical Nutrition, 10: 154–158. doi: 10.1111/j.1440-6047.2001.00232.x