Obviously you needed new screws, but using high tensile ones in that situation is a mixed blessing. The screws are much harder to strip, but the sole plate is not: any overtightening will now strip the sole plate, which is quite an expensive item. Also, it is fairly difficult to strip a soft straight-slot screw without first doing at least slight damage to the slot, which should serve as a warning. Also, the hexagonal recesses in the cap screws will now pack with crud and rust, making it difficult to remove them. With straight recesses, you can easily clean them by putting the edge of a screwdriver in the slot and tapping it sideways with a small hammer.
Having said all that, cap screws are prettier than straight slot screws - but I personally would not use them in that situation.
