If you are gaining strength then your muscle mass is not the same. It may appear the same but you are building more dense muscle if you are stronger. And, if you are gaining strength you are not at your full potential and should not start AAS yet.
"and if no side effects and I introduce the D-bol how long should I look for side effects before I begin the D-bol?" This statement shows me that you have not done your homework. Dbol is fast acting and used at the beginning of a cycle to "jumpstart" your lifting before the Test kicks in and should only be used for short periods of time as it is liver toxic and will cause more sides than Test.
Seriously, please study all the information on this site and get your diet and lifting regime squared and come back and ask these sort of questions when you have topped out naturally.
You should read up in the diet section and study macronutrients and how and when to eat what and also study up in the fitness forum and learn new ways to shock and refine your muscle. And, most importantly, study the PCT section backwards and forwards before ever beginning a cycle or you may pay dearly.
It sounds as if you are looking for bulk and the only way to do that is diet and heavy weights with low reps. Slow and deliberate.
You have plenty of natural Test in your system to achieve all that you wish you just need to be patient and do the proper things to achieve it. I realize i sound like your dad and also that telling a 23 year old to be patient is probably like banging my nads against the wall

but the fact is you are looking for a shortcut rather than put in the work. Go forth and LiFT! Good luck my friend.