Like VQ said, do not make the error of eating at maintenance on off days. You need to eat MORE on off days. The day AFTER lifting is when you GROW so that is the day when it is CRITICAL to get in enough calories.
I will warn you right now that you need to get over this fear of fat or you will never get much over 150. I've seen countless guys on these forums like you, who kept flipping out about fat, going on and on about being skinny fat and refusing to properly bulk because they were afraid of getting fat. You need to gain some fat. If you are bulking and not gaining any fat at all, then you are not gaining the maximum amount of muscle you could be. The fact that you are counting calories is good, but like stated in the post above, why are you factoring in calories burned during workouts? You do know that those estimations are horribly unreliable, right? Just ignore that.
Eat the same every day as VQ instructed and start growing. Like he said, you can always cut the fat off later. It isn't like the fat you gain is permanent. Believe me, I have gone on many, many diets and cut my excess fat many, many times. It isn't impossible, it does require willpower to diet down but so does bulking.
Trust me, it wasn't until I stopped being afraid of fat that I started growing. I started out like you, I was sick of being small though and eventually I decided that I had nothing to lose by bulking up. When I joined this site (eight years ago now, wow...) I was around 140 - 150 lbs somewhere, tiny and unhappy with my body. I read everything I could on this site for a good six months, learning everything I can. I encourage you to do the same. After eight years of doing HST, I am 100 lbs heavier than when I joined and I'm not fat. The reason I tell you this is not to stroke my ego, it is because I was in the same boat as you, I know where you are coming from and I'm telling you, what I did is not extraordinary, you don't have to be genetically blessed to do it. You can do it too. Or not. You can be one of the countless dozens who did not have the will to change their bodies. It's up to you. There is no try. You either do it or you don't.
We will all be here to help you if you decide to take the journey.