Yes, but let it go for at least a year so the decking has been through all the seasons, frost -20°, wet snow, autumn rain, summer sun, etc. If you feel that some boards are hopeless, try turning them over. I also have 34x145 decking, and in the autumn when it has rained for weeks, it is almost completely together, but in the summer there is 5 to 7 mm between the decking.
