Move the saddle forward so that the seat pin is in line with the concor logo. Level the saddle so that the tip of the front is in line with about a centimetre in front of the top edge of the rear. Put a shorter handlebar stem on. Tighten up your chain. Report back as to whether that has fixed your problem. If yes, great. If no, go back to the builder.
Move the saddle forward so that the seat pin is in line with the concor logo. Level the saddle so that the tip of the front is in line with about a centimetre in front of the top edge of the rear. Put a shorter handlebar stem on. Tighten up your chain. Report back as to whether that has fixed your problem. If yes, great. If no, go back to the builder.