So I just upgraded to shimano 105 10 speed with some gear skipping issues.. everytime i shifted to lower gear i need to shift down twice and back up once to be on the gear i wanted.. any info on that?

Also there're creaking noises from the front wheel (not sure) when riding the bike. Is it common? didn't experienced it before upgraded.

now im looking for a new wheelset, but still on the fence for staying with 18" or going for 20". any suggestions ?