"I also like to use dumbbells over barbells in most cases. I've tried using DB's for romanian deadlifts and shrugs before, but I don't like how bulky the dumbbells are when doing these exercises "... I understand and agree they can be cumbersome... The other component to your training (use of body weight) addresses some of these issues.

Another consideration is to use Lou Ferigno's (spelling?) approach which was light weight and extremely slow movement.... WOW WHAT SORENESS!!!!

Keep it going but know when you have reached your target as strength training will improve your strength but eventually lose your flexibility if not monitored.
"There is no right or wrong way, just a better way"... Soke Robert Murphy