tactic1: don’t use a graphics tablet (since they skid, and it’s easy to mis-select - hence my bitter comments earlier). Although I can even now get sub-40s easy enough with a tablet…should be easy for you mousers
tactic2: if you ever find yourself looking for tiles to choose for more than a second, give up. Hit r and try again. Basically, if you have time to realise you’re looking, you’re going too slow and will never hit 30 s. You soon get the hang of just going from one to the next without pausing for thought.
tactic3: go for all the obvious ones first, wherever they are (i.e. the adjacent pairs).
tactic4: think of the board as a being full of holes (where you’v removed stuff) which you’re trying to link together; when choosing two of three identical blocks, pick the pair that links two holes, or widens the gap - this increases your chances of finding more new pairs.