I dunno what to tell you, i cant take decision for you. Imo, at least your hotend doesnt leak, and seems to insulate well to the upper part. Which is more than we can say about others. Regarding temperature and stuff, its just a resistor in a hole. If the resistor fits fairly snugly in the hole, its all good. If the hole is too big then nothing good comes from a hole thats just too big.
So, about temperature, the key part is where the resistor meets the aluminium block it sits in. What can go bad is the way resistor is mounted in its hole. If there is too much space between resistor and block, the thermal contact is poor, then resistor needs to heat extremely high and much more than the heater block temperature. Ofc in the context resistor with poor thermal contact wont be able to heat up the high enough nor fast enough. What i also found to happen is that this way resistor gets worn out fast, its cold resistance change, usually increases: i had 6R8 resistors i replaced measuring like up to 8-9+R on a rcl bridge. This is perhaps why your resistor measures 7,5 instead of 6,8, but its not clear: perhaps the 5% margin plus some 0,4 multimeter error could give that 7,5 too.
On short, what i would do, i would replace a brand new resistor there. When putting the new one in, i would fill the hole with some heat transfer compound (just not graphite or silver or ones that conduct electricity). Also i'd put some kapton on the leads of the resistor, so they wont have oxigen to oxidize. Also i'd put *one single* cylindrical rotation of kapton around the resistor. Not more, just a single turn, for best thermal contact. And then if the hole size fits to resistor, it should work nicely.
So, about temperature, the key part is where the resistor meets the aluminium block it sits in. What can go bad is the way resistor is mounted in its hole. If there is too much space between resistor and block, the thermal contact is poor, then resistor needs to heat extremely high and much more than the heater block temperature. Ofc in the context resistor with poor thermal contact wont be able to heat up the high enough nor fast enough. What i also found to happen is that this way resistor gets worn out fast, its cold resistance change, usually increases: i had 6R8 resistors i replaced measuring like up to 8-9+R on a rcl bridge. This is perhaps why your resistor measures 7,5 instead of 6,8, but its not clear: perhaps the 5% margin plus some 0,4 multimeter error could give that 7,5 too.
On short, what i would do, i would replace a brand new resistor there. When putting the new one in, i would fill the hole with some heat transfer compound (just not graphite or silver or ones that conduct electricity). Also i'd put some kapton on the leads of the resistor, so they wont have oxigen to oxidize. Also i'd put *one single* cylindrical rotation of kapton around the resistor. Not more, just a single turn, for best thermal contact. And then if the hole size fits to resistor, it should work nicely.