your not going to speed up flowering once it has started.

yellowing of leaves happens to SOME plants usually late in the flower cycle, that may be normal, or am guessing ,your watering too much. If its early in the flower cycle,and your not overwatering ,give them alittle fert with nitrogen and epsom salts.

Tie them down if they are getting to tall, dont bend them to much at once, if you break a stem,wrap it tight with tape, I prefer black electric tape, you can wrap it tight,because it is almost done growing ,and it wont get strangled.

Tying down your plants almost always improves the buds, if you dont go crazy and break them off.

To be a good grower you must be patient, let the plants do what they need to do,they have been around a few million years and know what to do.
To much love probly kills more pot than the DEA finds each year..

good luck.