Re: Is this ok to do and will it affect my speed and/or powerlevels in a bad way?
Yes, Downstream will potentially rise 3dBmv as atteniation typically 3dB reduced, Upstream due to insertion loss =<1dBmv reduction. (on anything but SH3) Whynot re-zero counters and take a 24hr before after stats+ network log benchmark? Providing D/S is still -3dbmv to +7dbmv and post RS in not incrementing in 1000's every day...... but Level2 will need to tell you on SH3.
Regards Tony "Life is a Binary Inspired Turing Computed Hologram"(don't PM or @Mention me - in case ignoring you offends)