I've ended up putting about 40mm spacers in mine, but it needed to be quite stiff for off road use. Feels ok on the road too. They look like plastic pipe off cuts, but are some suspension makers official custom spacer material, but I recon with the corrrect bore pipe you could do just as well for pennies!
Progressive springs start much softer than standard, often down around 4.5 (force to squash units, don't remember quite what they are!) up to 7+ when under lots of compression, standards run 6 all the way. (So i read somewhere)
You could try thicker oil, mine runs 20wt stuff.
There are also other more professional ways, search for some posts from Actimoto, i think.
Mine is an early 650, VY model. Forks come out easy, drain by turning upside down! Don't think the type of fork oil matters on the TA, just the viscosity (weight?) high is thicker, so stiffens the action somewhat. Problem is getting the exact amount back in, better is to measure the oil height from the oil to the top of the fork, with spring removed and leg compressed, but that takes more equipment than I've got!!
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