Trying to replace the cold and hot water compression flexi pipes (with isolator valves) in the bathroom basin. The new ones are 15mm x 1/2" x 300mm which seems to match the length of the old ones (fitted by previous house owner). I'm finding it very difficult to replace the cold pipe without putting a kink in it. The hot water one seems to be ok - see photo (although the angles is still fairly tight). Is it best to replace the old olives with new ones. I'm not sure if I should try and go for longer flexi versions - 500 mm to try and avoid the tight angles (not sure if this would work or not).