To answer your question of offloading, it really depends on where Germany is exposing herself. You shouldn’t be crashing into Western Europe if it’s probable that Germany will still have an inf shield remaining, because Germany can replace those infantry really easily. You want to attack W. Europe only if you can take it, or destroy a lot of tanks, or if you can claim some fighters. Western Europe can be really tough to crack if stacked up because the Allies can only exert so much force from transports and have to do so in one turn; they can’t really build up troops as they could in Karelia for instance to overcome Eastern Europe.
I don’t find it necessary to feed troops into Russia’s northern border until Germany has fallen. I suppose I would if Germany were being ultra aggressive and Russia can’t handle the heat, but even then you might just want to exploit the German weakness elsewhere.
If Berlin and W. Europe are stacked, then you want to offload into Karelia and build up a force there, then work into Eastern Europe. There is a cracking point at which Germany can’t defend W/E Europe + Berlin and has to give up one, and once he starts retreating then you’re on your way to taking the capital.
With a 3x3 transport build you’ll want to use that extra money to build fighters, which give you flexible/reuseable offense as well as flexible defense for Moscow.
You don’t need an IC in Brazil. Just land troops in Algeria on round 1 and/or 2 and march them down. Send some airforce to Africa if you’re having problems there.
PS. also is it worth it to invest in bombers/heavy bombing so that I can launch strikes from the UK or will I just be wasting my money?
I wouldn’t recommend it in LHTR. LHTR limits bombers to the best of 2 dice rolls (and add 1 if strategic bombing), so heavy bombers is not worth researching. Due to bombing limits, just doing normal bombing isn’t a great choice either. You’re better off having actual units on the board contesting Africa and Europe than you are trying to punch Germany in the pocketbook. You would waste a lot of money that way since you almost have to build a bomber every turn to replenish bombers that might die in this turn’s bombing raid.