What does the rest of your diet look like? That's where gains start....in the kitchen. Right now you way undersized and bodyfat is too high for steroid use. You need to get your diet in tune first and foremost. Have a look at my diet and nutrition thread for some help in that area
https://www.isarms.com/forums/steroids-sarms-information/diet-nutrition-basics-101-a-3314.html
I think a sarms cycle could treat you quite well for your goals of gaining muscle size, but you also need to drop that bodyfat down a bit too. I think the perfct stack for you is going to be the ultra Recomp stack from
www.sarmsx.com
It's perfect for the size and strength you are after and will help with getting you some fat loss as well
https://www.sarmsx.com/stacks/ultra-recomp-stack-12-weeks-2
1-12 lgd-4033 10 mg day dosed once a day in the a.m.
1-12 S4 50 mg day... split doses... 25 mg in the a.m. and 25 mg 4-6 hours later
1-12 GW-510516 (CARDARINE) 20 mg day… dosed all at once 30 minutes before workout…
1-12 RAD-140 20mg day dosed once a day in the a.m.
PCT
Clomid 50/25/25/25
GW 20mg per day
https://www.sarmsx.com/stacks/sarms-mini-pct-stack-1
(PM me for a price list for Biotech Labs and 10% discount)