i put Poyal Purple Synchromax in about 300miles ago. I too had hard shifting issues. It still is a little hard while it's cold but after it's warmed up it's smooth as butter. I have a MM Firewall Adj. and cable to install. so that should hope fully take care of it all
The fluid isnt going to help your specific problem. If shifting is as bad as you say its definetly your firewall adjuster/quadrant. I had the same issues and went the same route. It was the adjuster that solved my problem.