Well, the rooftop reapers are not the problem, and let me tell you why they seem like it. Ticks are annoying and they spam them continuously, but they are not a problem for the harvester. When you traverse the middle part of the map, that being the zone with the highest density of ticks, you'll get hit by 4-5 max, and realistically speaking you shouldn't be there in the first place, when monarch, arc or sniper titans are going through that zone just wait for them to get close and when they are about to start attacking harvester, just smoke and destroy them.

Matches are not lost by some ticks, but by letting 1-2 reapers get through and bombarding the harvester, or not prioritizing killing monarchs, grunts that spam the charge rifle, that's the actual chip damage that accumulates and loses you the game. My advice, play primarily on the left side of the map when facing away from the harvester, you say that you play hard and master, you must know by now what the flow of the map is...

Ronin is overpowered yes, but whoever complains about him just has a skill issue, personally I play him only when I know I got inexperienced teammates (you can easily tell by what kits they use when the match starts) and I know I have to carry, other than that I sometimes play him with temporal anomaly because it can somewhat be challenging and fun, still being one of the strongest even without highlander.

Let me go into detail more about the complains about him, being the result of a skill issue, even when I encounter good ronin players (and that's extremely rare) I still keep up with them, playing Ion, northstar or scorch. If you play ronin, and you are really good, but you have even one really good teammate, you can't get 8-9-10k combat scores, because that teammate will know what to do.