I guess you should try a 25c or try 120psi for the rear
maybe 105psi (probably drops another 5psi when you pull off the pump) for 210lbs + bag + rack was too low.
for the record... which tyre?
hehehe... maybe my mistake though, its an
IRC Redstorm the road racing version (red colour). It was used by the Japan team during Tour de Langkawi in Malaysia. A neighbour to my officemate was in charged of taking care of the team. So once the tour ended it was given as souvenir to him. Since both of them do not have a roadbike, the tyres were passed to me. Grips well though. Good for the road even when it is wet, but maybe not suitable for heavy load.