|Completely different engines, so may be irrelevant but on my Mog with a Xflow I had the same issue - replaced the 82 degree thermostat with a 92 degree and now getting decent heat.
Had a similar problem with the Vx Corsa and that was down to an airlock in the matrix - the in pipe was hot, but not the out pipe. I spent some time squeezing hoses and now gone. On the Mog I fitted a airbleed into the exit hose, wish Vx had done the same.
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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