A light Chinese rubber with a little catapult and decent spin

[Choosikick]

You can try the Kokutaku Blutenkirche Tokyo 868 with a blue sponge. It is very cheap, tenacious, has average stickiness, average or even below average speed and is quite light as for chinese rubber - my rubber in a cut form weighs only 46 grams. For its 5 dollars, it is better than Rxton 1 and comparable to Mercury 2.
By the way, Rxton 3 is also very good and also fits your description.

 

[Lazer]

You can try the Kokutaku Blutenkirche Tokyo 868 with a blue sponge. It is very cheap, tenacious, has average stickiness, average or even below average speed and is quite light as for chinese rubber - my rubber in a cut form weighs only 46 grams. For its 5 dollars, it is better than Rxton 1 and comparable to Mercury 2.
By the way, Rxton 3 is also very good and also fits your description.

Don't know about Kokotaku, could be worth a try but my confidence in Loki is very low at best...

Cheers
L-zr