Frank, any metcon you do will cut into your potential gains on SS. It might mean you reach the intermediate phase at lower weights. It might also take you another couple of months for your linear progression to top out. So it's not necessarily bad.
Generally, the best way to get good at X is to do X, eat for X, and recover for X. When you add Y, there are problems. (You see what I did there, ladies?). Some problems you can live with; some you can't.
If you want to add metcon, add a light one on Friday. Then maybe add one on Wednesday after a month. At this point your SS workouts should be difficult, so you'll have to add even more.
"It should be more like birthday party than physics class." | Log
| 70's Big