top 'o the day to everyone. recently been noticing more pulsing vibes in the bars and especially in the mirrors at certain rpm ranges in different gears. mostly aound just before mid range only. mirrors and grips are smooth and clear after 5500rpm's. prior to gettin' past the 4000 mi mark, i never felt those or seen in the mirrors the amount of pulsing vibes i feel now in that rpm area. this typical or can be expected more as the bike ages in miles?