I’ve now got a 150mm fork on my TranceX. What sag have you got (25-30%)? I have a low rise bar and a 65mm stem on directly ontop of the headset.
I recall that the bike came with a 120mm fork and a big stack of spacers under the stem, so the bar height now is lower than the setup it came with. What made a significant difference is the rear shock sag. I had to reduce it a bit by putting more air in, raising the the BB, in order to “equalise” the suspension action front and back.
{I realise position is a very personal thing, so what works for me may not work for you}