Rather than raise the cost of STR (and CON - both generate more figured char than they cost themselves), what about reducing the cost of END, STUN and REC so the benefits granted by STR and CON are less costly for a lower STR/CON character to purchase directly.
I'd like to see +15 STR grant +5 stats (and a -1/2 limit for "No Figured"), and +15 CON grant 22 points of figured (with "no figured" priced at -2 3/4). At this point, you could sever them without complications (leaving only BOD). No need to change DEX - it works already.
This would require lowering the price of REC, STUN and END. Changing PD and ED changes the dynamic between other defense powers, so it should be avoided. As a rough guideline, I would consider the following:
Reduce the price of STUN to 1/2 point, REC to 1 point and END to 1/3 point. Declare them "defensive powers" so that adjustment powers do not gain a huge advantage.
Grant figured as follows:
STR grants STR/5 in PD and STR/7.5 in REC.
10 STR grants 2 PD and 1 REC
15 STR grants 3 PD and 2 REC, which costs 5 points otherwise.
No Figured is a -1/2 limitation on STR.
CON grants CON/5 in ED, CON/3.75 in REC, 2/3 CON in STUN and 2x CON in END.
10 CON grants 2 ED, 3 REC, 7 STUN and 20 END.
15 CON grants 3 ED, 4 REC, 10 STUN and 30 END, which costs 22 points otherwise. 30/(30-22) = 3.75, so No Figured on CON is a -2 3/4 limitation (yes, I know, it's more than -2; utter blasphemy - break it down into separate limitations for each figured stat to get them each below -2 3/4 and stop whining).
BOD grants BOD x 1 1/3 STUN.
10 BOD grants 13 STUN
15 BOD grants 20 STUN, which is worth 10 points. No Figured is a -1/2 limitation on BOD.
RESULT: No Figured Char is now mathematically correct - someone might actually take CON - no figured! DEX and SPD are unchanged, so -1/2 works.
We can now eliminate the "can only sell back 1 figured" restriction, since there's no advantage to buying up a stat and selling the figured characteristics back.
A standard (10's across the board) guy has the same base figured's as before.
BOD and CON contribute more, and STR contributes less. Appropriate as STR gives considerably more other benefits.
Potentially, this will cause other changes to the dynamic. For example, since there is no longer a "figured' advantage to high STR and CON, do we need to allow EC's of characteristics for Bricks and other stat-based characters to stay balanced with, say, blasters and others more reliant on frameworks?
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