Id normally point you to Matt at ProComp motorsport here. He supported a lot of the 750 motor club racers and had a good reputation from most (he would get on his high horse and annoy some people - especially about roll cages for which he was on the MSA committee). One of his services was dyno testing shocks and recalibrating them. He'd happily bend your ear for an hour without selling you anything, telling you more than you ever wanted to know about shocks and racing. Unfortunately he passed away recently.
The summary of my last conversation was typically him. I was asking about him supplying some Protech shocks for road use as it didn't seem cost effective to buy the adjustable collars for the existing Bilsteins. He told me to buy direct from Protech, drive them for a few months and only then if i wasn't happy to bring them to him. He'd happily revalve, change the oil and provide dyno sheets to confirm they were all the same for not a lot of money, but he didn't think it was worth it for my use so didn't try to sell to me.
If you're chasing the last 0.1s then i'm sure very expensive shocks will assist. If you're trying to get to the pub or enjoy a track day I suspect the Protechs will be fine. Another member on here has just bought Protechs. It would be worth you talking to him.
(and if you've got adjustable collars on your Bilsteins - i'll have them off you for 50p and a packet of crisps)