On your off days you don't need to eat as much because protein synthesis is lower, thus there is no need to supply as much energy
If you are bloated and feeling uncomfortable, then you are probably eating too much calorie wise, or simply too much volume, trying to eat 1000 calories of lettuce would block you up readily for example.
There is also no need to bulk to tremendous amounts, it is not like you can
gain muscle at extreme rates, you are looking realistically like maybe a 1/4 lbs a week if you are lucky.
Try to eat 10% more than you normally would to maintain, then adjust as necessary to get results.
-Cliff