I purchased 100 of the UK packaging IPs and, in general, they are great and work well in all razors I've tried. But, I'm trying to really dial in a 50's, UK ball-end Tech with technique improvements, yet still get some neck irritation after 3/4 days in a row. Is there a blade you can recommend that offers similar sharpness (or maybe even a touch sharper) with more smoothness, ideally in that style of razor?