hit hour 340 and 春秋 is messing up my recall metrics

Logging my Anki Phase 2 metrics today at hour 342. Hit kanji #1104 春秋 and my 10s recall rate dropped by 14%. It keeps overlapping in my mental index with 左右 and 出入 since they all use opposite pairing logic. I categorized 春秋 under category 4B opposite pairs, but the spring/autumn vs year meaning delay adds a 1.2s lag to my SRS response time. Anyone else sub-batching these?