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From what you describe, you're doing very well with your existing setup unless by "signal strength is low" you mean you're getting drop outs. Extra strength does not improve the picture quality but provides protection against pixellation and drop-outs. You're getting the complete Montreal market except for an independent station on 62.1 (RF 49), which just might be off-air for some reason. You do have two VHF stations, 10 that carries TVA and 12 that carries CTV, but the DB2 is catching them well enough. There's no point trying for any other Canadian stations, as they will carry duplicates of programming you already receive.
To improve the relaibility of the CBS and NBS stations, and have a shot at getting a PBS station from the US, you're going to need a lot bigger antenna.
To reliably raise the signal strength of what you receive now, you're going to have to graduate to an AntennaCraft HBU-33 or a Winegard HD7694P. If you want to go for the US stations, then a Winegard HD7698P would be required. In either case, you should aim the antenna due south.
As far as antenna height is concerned, since you already have LOS to Montreal, it's a matter of either shooting under or over the leaves. It appears that the height you're using now is OK. The trouble is, the antennas I've recommended won't easily mount to the side of the cabin. You could roof-mount (leaves in the way?) or mount to a pole driven into the ground.
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