[Antennas] Dipole SWR

[John]

Hi all

I just moved my 75 meter dipole from 25 feet to 60 feet at the apex & ends
are at about 45feet .  The problem is the SWR at the lower height was about
1.2 ...... But now that I raised the antenna , the lowest it goes is 1.6
..... is this because the dipole is starting to have it characteristic 72ohm
impedance as I go up in height ??  If so can I use a 75ohm quarter wave long
coax to match it to the 50 ohm ??

Thanks john