Minimal valve to piston clearance with the TFS stage 1 cam being used likely occurs somewhere around zero to 10 ATDC. At that point, depending on the cam timing used, the lifter is somewhere around .050-.070" lift (lobe lift) which means the valve lift is somewhere around 1.6 times that; 1.7 times that with the other rockers. Do the math --- 1.6X.050" = valve lift of .080"; with the 1.7's that's .085" valve lift. There's your .005" difference - at the same point of minimum clearance, if you bolt on the 1.7 rocker, it's gonna hold the valve open .005" more at that point -- so you'd lose that much p to v clearance.
You need to measure your engine -- the differences can vary due to valve train geometry, stiffness of the rocker, variation from cylinder to cylinder, etc. But as you can see, even with variations, the reduction in p to v due to rocker ratio change with most milder street cams is relatively minor. In general -- rocker ratio change usually will neither cause a p to v problem -- nor solve one for you. As cam duration increases - and intakes open sooner/exhaust closes later - the differences will be greater. If in doubt - measure yours. But if you've got .200" to start with - a simple 1.6 to 1.7 rocker change isn't gonna come anywhere close to causing a problem. You're looking for .080"-.100" clearance on the intake and .100"-.125" clearance on the exhaust for safety. You can see - the change in clearance with the rocker swap is AN ORDER OF MAGNITUDE smaller than the clearances needed.