Welcome bro.
15 to 20% is too far of a range. We're talking about a great start at 15 % and you should not cycle at 20%.
Quick notes...
1. Changing your dosage throughout the cycle is not needed. Stick with a dose throughout your entire cycle.
2. Letro is quite a powerful AI, you should use something that is more manageable, such as Adex.
3. Your cycle is too long.
4. You really should stick to prop only and wait for your next cycle to run var.
Now, your cycle layout is making me blind, so let me help you out with what I think a first cycle should consist of...
Week 1 to 8 - Test Prop @ 100 to 150 MAX EOD.
Week 1 to 8 - HCG @ 250iu twice weekly.
Week 1 to 8 - Adex @ 0.25 EOD
Stop everything for 3 days and then...
PCT: clomid 100/50/50/50 and novla 40/20/20/20
You need to learn how your body reacts to Test only for your first cycle, this way you're not playing a guessing game trying to figure out which compound is causing the side effects. Furthermore; cycling at 20% BF is going to cause more harm than good. You risk blood pressure issues, higher risk of gyno, etc..., Anavar will do nothing at that body fat.
Lastly, understand that bulking and cutting starts with diet, AAS will merely amplify your diet's effects. If diet is poor, results will be minimal if any, and you will end up wasting time and money. Visit the nutrition section, let the pro's there know what your goals are and what you plan on eating in a typical day and they will help you maximize your results.
Best of luck to you.