sounds like you got things dialed in and are making good progress..
as far as looking 'un-natural' , even apart from the primo statement . well it could take years and years of steady training and running gear to get that 'un-natural' look ,, or you could be a Doug Miller and pass a drug test and be 'natural' yet look un-natural , or you could be that guy at the gym who has been running a shit ton of compounds for years and still looks like he does not even lift.
just saying ,, but especially with Primo, and especially for that short of time . Its a very slow and very mild compound . Last time I ran it I ran it for 20 weeks.. It does not aromatize and has very little sides , so yes your correct you may not get that 'un-natural' puffy bloated look (but if you control diet and manage estrodial you can stay away from that look with any compound) .. Primo seems to work best (i.e., bring about more apparent or visible results) at a lower body fat percentage to help bring out the muscle you already do have (which you can see when the BF% is down) rather then being a highly anabolic compound and building or putting on muscle mass.
But, like your doing . its a very mild compound that works great on a cutting cycle or calorie restrictive diet because it will help you stay anabolic and maintain muscle mass while cutting .. great compound, but yeah I think we both agree , nothing about it is going to make someone look 'un-natural' in 7 weeks